diff --git a/_js/es5-sham.js b/_js/es5-sham.js
new file mode 100644
index 00000000..20c98459
--- /dev/null
+++ b/_js/es5-sham.js
@@ -0,0 +1,446 @@
+// Copyright 2009-2012 by contributors, MIT License
+// vim: ts=4 sts=4 sw=4 expandtab
+
+//Add semicolon to prevent IIFE from being passed as argument to concated code.
+;
+// Module systems magic dance
+(function (definition) {
+    // RequireJS
+    if (typeof define == "function") {
+        define(definition);
+    // YUI3
+    } else if (typeof YUI == "function") {
+        YUI.add("es5-sham", definition);
+    // CommonJS and <script>
+    } else {
+        definition();
+    }
+})(function () {
+
+
+var call = Function.prototype.call;
+var prototypeOfObject = Object.prototype;
+var owns = call.bind(prototypeOfObject.hasOwnProperty);
+
+// If JS engine supports accessors creating shortcuts.
+var defineGetter;
+var defineSetter;
+var lookupGetter;
+var lookupSetter;
+var supportsAccessors;
+if ((supportsAccessors = owns(prototypeOfObject, "__defineGetter__"))) {
+    defineGetter = call.bind(prototypeOfObject.__defineGetter__);
+    defineSetter = call.bind(prototypeOfObject.__defineSetter__);
+    lookupGetter = call.bind(prototypeOfObject.__lookupGetter__);
+    lookupSetter = call.bind(prototypeOfObject.__lookupSetter__);
+}
+
+// ES5 15.2.3.2
+// http://es5.github.com/#x15.2.3.2
+if (!Object.getPrototypeOf) {
+    // https://github.com/es-shims/es5-shim/issues#issue/2
+    // http://ejohn.org/blog/objectgetprototypeof/
+    // recommended by fschaefer on github
+    Object.getPrototypeOf = function getPrototypeOf(object) {
+        return object.__proto__ || (
+            object.constructor
+                ? object.constructor.prototype
+                : prototypeOfObject
+        );
+    };
+}
+
+//ES5 15.2.3.3
+//http://es5.github.com/#x15.2.3.3
+
+function doesGetOwnPropertyDescriptorWork(object) {
+    try {
+        object.sentinel = 0;
+        return Object.getOwnPropertyDescriptor(
+                object,
+                "sentinel"
+        ).value === 0;
+    } catch (exception) {
+        // returns falsy
+    }
+}
+
+//check whether getOwnPropertyDescriptor works if it's given. Otherwise,
+//shim partially.
+if (Object.defineProperty) {
+    var getOwnPropertyDescriptorWorksOnObject = 
+        doesGetOwnPropertyDescriptorWork({});
+    var getOwnPropertyDescriptorWorksOnDom = typeof document == "undefined" ||
+    doesGetOwnPropertyDescriptorWork(document.createElement("div"));
+    if (!getOwnPropertyDescriptorWorksOnDom || 
+            !getOwnPropertyDescriptorWorksOnObject
+    ) {
+        var getOwnPropertyDescriptorFallback = Object.getOwnPropertyDescriptor;
+    }
+}
+
+if (!Object.getOwnPropertyDescriptor || getOwnPropertyDescriptorFallback) {
+    var ERR_NON_OBJECT = "Object.getOwnPropertyDescriptor called on a non-object: ";
+
+    Object.getOwnPropertyDescriptor = function getOwnPropertyDescriptor(object, property) {
+        if ((typeof object != "object" && typeof object != "function") || object === null) {
+            throw new TypeError(ERR_NON_OBJECT + object);
+        }
+
+        // make a valiant attempt to use the real getOwnPropertyDescriptor
+        // for I8's DOM elements.
+        if (getOwnPropertyDescriptorFallback) {
+            try {
+                return getOwnPropertyDescriptorFallback.call(Object, object, property);
+            } catch (exception) {
+                // try the shim if the real one doesn't work
+            }
+        }
+
+        // If object does not owns property return undefined immediately.
+        if (!owns(object, property)) {
+            return;
+        }
+
+        // If object has a property then it's for sure both `enumerable` and
+        // `configurable`.
+        var descriptor =  { enumerable: true, configurable: true };
+
+        // If JS engine supports accessor properties then property may be a
+        // getter or setter.
+        if (supportsAccessors) {
+            // Unfortunately `__lookupGetter__` will return a getter even
+            // if object has own non getter property along with a same named
+            // inherited getter. To avoid misbehavior we temporary remove
+            // `__proto__` so that `__lookupGetter__` will return getter only
+            // if it's owned by an object.
+            var prototype = object.__proto__;
+            object.__proto__ = prototypeOfObject;
+
+            var getter = lookupGetter(object, property);
+            var setter = lookupSetter(object, property);
+
+            // Once we have getter and setter we can put values back.
+            object.__proto__ = prototype;
+
+            if (getter || setter) {
+                if (getter) {
+                    descriptor.get = getter;
+                }
+                if (setter) {
+                    descriptor.set = setter;
+                }
+                // If it was accessor property we're done and return here
+                // in order to avoid adding `value` to the descriptor.
+                return descriptor;
+            }
+        }
+
+        // If we got this far we know that object has an own property that is
+        // not an accessor so we set it as a value and return descriptor.
+        descriptor.value = object[property];
+        descriptor.writable = true;
+        return descriptor;
+    };
+}
+
+// ES5 15.2.3.4
+// http://es5.github.com/#x15.2.3.4
+if (!Object.getOwnPropertyNames) {
+    Object.getOwnPropertyNames = function getOwnPropertyNames(object) {
+        return Object.keys(object);
+    };
+}
+
+// ES5 15.2.3.5
+// http://es5.github.com/#x15.2.3.5
+if (!Object.create) {
+
+    // Contributed by Brandon Benvie, October, 2012
+    var createEmpty;
+    var supportsProto = Object.prototype.__proto__ === null;
+    if (supportsProto || typeof document == 'undefined') {
+        createEmpty = function () {
+            return { "__proto__": null };
+        };
+    } else {
+        // In old IE __proto__ can't be used to manually set `null`, nor does
+        // any other method exist to make an object that inherits from nothing,
+        // aside from Object.prototype itself. Instead, create a new global
+        // object and *steal* its Object.prototype and strip it bare. This is
+        // used as the prototype to create nullary objects.
+        createEmpty = function () {
+            var iframe = document.createElement('iframe');
+            var parent = document.body || document.documentElement;
+            iframe.style.display = 'none';
+            parent.appendChild(iframe);
+            iframe.src = 'javascript:';
+            var empty = iframe.contentWindow.Object.prototype;
+            parent.removeChild(iframe);
+            iframe = null;
+            delete empty.constructor;
+            delete empty.hasOwnProperty;
+            delete empty.propertyIsEnumerable;
+            delete empty.isPrototypeOf;
+            delete empty.toLocaleString;
+            delete empty.toString;
+            delete empty.valueOf;
+            empty.__proto__ = null;
+
+            function Empty() {}
+            Empty.prototype = empty;
+            // short-circuit future calls
+            createEmpty = function () {
+                return new Empty();
+            };
+            return new Empty();
+        };
+    }
+
+    Object.create = function create(prototype, properties) {
+
+        var object;
+        function Type() {}  // An empty constructor.
+
+        if (prototype === null) {
+            object = createEmpty();
+        } else {
+            if (typeof prototype !== "object" && typeof prototype !== "function") {
+                // In the native implementation `parent` can be `null`
+                // OR *any* `instanceof Object`  (Object|Function|Array|RegExp|etc)
+                // Use `typeof` tho, b/c in old IE, DOM elements are not `instanceof Object`
+                // like they are in modern browsers. Using `Object.create` on DOM elements
+                // is...err...probably inappropriate, but the native version allows for it.
+                throw new TypeError("Object prototype may only be an Object or null"); // same msg as Chrome
+            }
+            Type.prototype = prototype;
+            object = new Type();
+            // IE has no built-in implementation of `Object.getPrototypeOf`
+            // neither `__proto__`, but this manually setting `__proto__` will
+            // guarantee that `Object.getPrototypeOf` will work as expected with
+            // objects created using `Object.create`
+            object.__proto__ = prototype;
+        }
+
+        if (properties !== void 0) {
+            Object.defineProperties(object, properties);
+        }
+
+        return object;
+    };
+}
+
+// ES5 15.2.3.6
+// http://es5.github.com/#x15.2.3.6
+
+// Patch for WebKit and IE8 standard mode
+// Designed by hax <hax.github.com>
+// related issue: https://github.com/es-shims/es5-shim/issues#issue/5
+// IE8 Reference:
+//     http://msdn.microsoft.com/en-us/library/dd282900.aspx
+//     http://msdn.microsoft.com/en-us/library/dd229916.aspx
+// WebKit Bugs:
+//     https://bugs.webkit.org/show_bug.cgi?id=36423
+
+function doesDefinePropertyWork(object) {
+    try {
+        Object.defineProperty(object, "sentinel", {});
+        return "sentinel" in object;
+    } catch (exception) {
+        // returns falsy
+    }
+}
+
+// check whether defineProperty works if it's given. Otherwise,
+// shim partially.
+if (Object.defineProperty) {
+    var definePropertyWorksOnObject = doesDefinePropertyWork({});
+    var definePropertyWorksOnDom = typeof document == "undefined" ||
+        doesDefinePropertyWork(document.createElement("div"));
+    if (!definePropertyWorksOnObject || !definePropertyWorksOnDom) {
+        var definePropertyFallback = Object.defineProperty,
+            definePropertiesFallback = Object.defineProperties;
+    }
+}
+
+if (!Object.defineProperty || definePropertyFallback) {
+    var ERR_NON_OBJECT_DESCRIPTOR = "Property description must be an object: ";
+    var ERR_NON_OBJECT_TARGET = "Object.defineProperty called on non-object: "
+    var ERR_ACCESSORS_NOT_SUPPORTED = "getters & setters can not be defined " +
+                                      "on this javascript engine";
+
+    Object.defineProperty = function defineProperty(object, property, descriptor) {
+        if ((typeof object != "object" && typeof object != "function") || object === null) {
+            throw new TypeError(ERR_NON_OBJECT_TARGET + object);
+        }
+        if ((typeof descriptor != "object" && typeof descriptor != "function") || descriptor === null) {
+            throw new TypeError(ERR_NON_OBJECT_DESCRIPTOR + descriptor);
+        }
+        // make a valiant attempt to use the real defineProperty
+        // for I8's DOM elements.
+        if (definePropertyFallback) {
+            try {
+                return definePropertyFallback.call(Object, object, property, descriptor);
+            } catch (exception) {
+                // try the shim if the real one doesn't work
+            }
+        }
+
+        // If it's a data property.
+        if (owns(descriptor, "value")) {
+            // fail silently if "writable", "enumerable", or "configurable"
+            // are requested but not supported
+            /*
+            // alternate approach:
+            if ( // can't implement these features; allow false but not true
+                !(owns(descriptor, "writable") ? descriptor.writable : true) ||
+                !(owns(descriptor, "enumerable") ? descriptor.enumerable : true) ||
+                !(owns(descriptor, "configurable") ? descriptor.configurable : true)
+            )
+                throw new RangeError(
+                    "This implementation of Object.defineProperty does not " +
+                    "support configurable, enumerable, or writable."
+                );
+            */
+
+            if (supportsAccessors && (lookupGetter(object, property) ||
+                                      lookupSetter(object, property)))
+            {
+                // As accessors are supported only on engines implementing
+                // `__proto__` we can safely override `__proto__` while defining
+                // a property to make sure that we don't hit an inherited
+                // accessor.
+                var prototype = object.__proto__;
+                object.__proto__ = prototypeOfObject;
+                // Deleting a property anyway since getter / setter may be
+                // defined on object itself.
+                delete object[property];
+                object[property] = descriptor.value;
+                // Setting original `__proto__` back now.
+                object.__proto__ = prototype;
+            } else {
+                object[property] = descriptor.value;
+            }
+        } else {
+            if (!supportsAccessors) {
+                throw new TypeError(ERR_ACCESSORS_NOT_SUPPORTED);
+            }
+            // If we got that far then getters and setters can be defined !!
+            if (owns(descriptor, "get")) {
+                defineGetter(object, property, descriptor.get);
+            }
+            if (owns(descriptor, "set")) {
+                defineSetter(object, property, descriptor.set);
+            }
+        }
+        return object;
+    };
+}
+
+// ES5 15.2.3.7
+// http://es5.github.com/#x15.2.3.7
+if (!Object.defineProperties || definePropertiesFallback) {
+    Object.defineProperties = function defineProperties(object, properties) {
+        // make a valiant attempt to use the real defineProperties
+        if (definePropertiesFallback) {
+            try {
+                return definePropertiesFallback.call(Object, object, properties);
+            } catch (exception) {
+                // try the shim if the real one doesn't work
+            }
+        }
+
+        for (var property in properties) {
+            if (owns(properties, property) && property != "__proto__") {
+                Object.defineProperty(object, property, properties[property]);
+            }
+        }
+        return object;
+    };
+}
+
+// ES5 15.2.3.8
+// http://es5.github.com/#x15.2.3.8
+if (!Object.seal) {
+    Object.seal = function seal(object) {
+        // this is misleading and breaks feature-detection, but
+        // allows "securable" code to "gracefully" degrade to working
+        // but insecure code.
+        return object;
+    };
+}
+
+// ES5 15.2.3.9
+// http://es5.github.com/#x15.2.3.9
+if (!Object.freeze) {
+    Object.freeze = function freeze(object) {
+        // this is misleading and breaks feature-detection, but
+        // allows "securable" code to "gracefully" degrade to working
+        // but insecure code.
+        return object;
+    };
+}
+
+// detect a Rhino bug and patch it
+try {
+    Object.freeze(function () {});
+} catch (exception) {
+    Object.freeze = (function freeze(freezeObject) {
+        return function freeze(object) {
+            if (typeof object == "function") {
+                return object;
+            } else {
+                return freezeObject(object);
+            }
+        };
+    })(Object.freeze);
+}
+
+// ES5 15.2.3.10
+// http://es5.github.com/#x15.2.3.10
+if (!Object.preventExtensions) {
+    Object.preventExtensions = function preventExtensions(object) {
+        // this is misleading and breaks feature-detection, but
+        // allows "securable" code to "gracefully" degrade to working
+        // but insecure code.
+        return object;
+    };
+}
+
+// ES5 15.2.3.11
+// http://es5.github.com/#x15.2.3.11
+if (!Object.isSealed) {
+    Object.isSealed = function isSealed(object) {
+        return false;
+    };
+}
+
+// ES5 15.2.3.12
+// http://es5.github.com/#x15.2.3.12
+if (!Object.isFrozen) {
+    Object.isFrozen = function isFrozen(object) {
+        return false;
+    };
+}
+
+// ES5 15.2.3.13
+// http://es5.github.com/#x15.2.3.13
+if (!Object.isExtensible) {
+    Object.isExtensible = function isExtensible(object) {
+        // 1. If Type(O) is not Object throw a TypeError exception.
+        if (Object(object) !== object) {
+            throw new TypeError(); // TODO message
+        }
+        // 2. Return the Boolean value of the [[Extensible]] internal property of O.
+        var name = '';
+        while (owns(object, name)) {
+            name += '?';
+        }
+        object[name] = true;
+        var returnValue = owns(object, name);
+        delete object[name];
+        return returnValue;
+    };
+}
+
+});
diff --git a/_js/es5-shim.js b/_js/es5-shim.js
new file mode 100644
index 00000000..8a16d393
--- /dev/null
+++ b/_js/es5-shim.js
@@ -0,0 +1,1360 @@
+// Copyright 2009-2012 by contributors, MIT License
+// vim: ts=4 sts=4 sw=4 expandtab
+
+//Add semicolon to prevent IIFE from being passed as argument to concated code.
+;
+// Module systems magic dance
+(function (definition) {
+    // RequireJS
+    if (typeof define == "function") {
+        define(definition);
+    // YUI3
+    } else if (typeof YUI == "function") {
+        YUI.add("es5", definition);
+    // CommonJS and <script>
+    } else {
+        definition();
+    }
+})(function () {
+
+/**
+ * Brings an environment as close to ECMAScript 5 compliance
+ * as is possible with the facilities of erstwhile engines.
+ *
+ * Annotated ES5: http://es5.github.com/ (specific links below)
+ * ES5 Spec: http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf
+ * Required reading: http://javascriptweblog.wordpress.com/2011/12/05/extending-javascript-natives/
+ */
+
+// ES-5 15.1.2.2
+if (parseInt('08') !== 8) {
+    parseInt = (function (origParseInt) {
+        var hexRegex = /^0[xX]/;
+        return function parseIntES5(str, radix) {
+            str = String(str).trim();
+            if (!+radix) {
+                radix = hexRegex.test(str) ? 16 : 10;
+            }
+            return origParseInt(str, radix);
+        };
+    }(parseInt));
+}
+
+//
+// Function
+// ========
+//
+
+// ES-5 15.3.4.5
+// http://es5.github.com/#x15.3.4.5
+
+function Empty() {}
+
+if (!Function.prototype.bind) {
+    Function.prototype.bind = function bind(that) { // .length is 1
+        // 1. Let Target be the this value.
+        var target = this;
+        // 2. If IsCallable(Target) is false, throw a TypeError exception.
+        if (typeof target != "function") {
+            throw new TypeError("Function.prototype.bind called on incompatible " + target);
+        }
+        // 3. Let A be a new (possibly empty) internal list of all of the
+        //   argument values provided after thisArg (arg1, arg2 etc), in order.
+        // XXX slicedArgs will stand in for "A" if used
+        var args = _Array_slice_.call(arguments, 1); // for normal call
+        // 4. Let F be a new native ECMAScript object.
+        // 11. Set the [[Prototype]] internal property of F to the standard
+        //   built-in Function prototype object as specified in 15.3.3.1.
+        // 12. Set the [[Call]] internal property of F as described in
+        //   15.3.4.5.1.
+        // 13. Set the [[Construct]] internal property of F as described in
+        //   15.3.4.5.2.
+        // 14. Set the [[HasInstance]] internal property of F as described in
+        //   15.3.4.5.3.
+        var binder = function () {
+
+            if (this instanceof bound) {
+                // 15.3.4.5.2 [[Construct]]
+                // When the [[Construct]] internal method of a function object,
+                // F that was created using the bind function is called with a
+                // list of arguments ExtraArgs, the following steps are taken:
+                // 1. Let target be the value of F's [[TargetFunction]]
+                //   internal property.
+                // 2. If target has no [[Construct]] internal method, a
+                //   TypeError exception is thrown.
+                // 3. Let boundArgs be the value of F's [[BoundArgs]] internal
+                //   property.
+                // 4. Let args be a new list containing the same values as the
+                //   list boundArgs in the same order followed by the same
+                //   values as the list ExtraArgs in the same order.
+                // 5. Return the result of calling the [[Construct]] internal
+                //   method of target providing args as the arguments.
+
+                var result = target.apply(
+                    this,
+                    args.concat(_Array_slice_.call(arguments))
+                );
+                if (Object(result) === result) {
+                    return result;
+                }
+                return this;
+
+            } else {
+                // 15.3.4.5.1 [[Call]]
+                // When the [[Call]] internal method of a function object, F,
+                // which was created using the bind function is called with a
+                // this value and a list of arguments ExtraArgs, the following
+                // steps are taken:
+                // 1. Let boundArgs be the value of F's [[BoundArgs]] internal
+                //   property.
+                // 2. Let boundThis be the value of F's [[BoundThis]] internal
+                //   property.
+                // 3. Let target be the value of F's [[TargetFunction]] internal
+                //   property.
+                // 4. Let args be a new list containing the same values as the
+                //   list boundArgs in the same order followed by the same
+                //   values as the list ExtraArgs in the same order.
+                // 5. Return the result of calling the [[Call]] internal method
+                //   of target providing boundThis as the this value and
+                //   providing args as the arguments.
+
+                // equiv: target.call(this, ...boundArgs, ...args)
+                return target.apply(
+                    that,
+                    args.concat(_Array_slice_.call(arguments))
+                );
+
+            }
+
+        };
+
+        // 15. If the [[Class]] internal property of Target is "Function", then
+        //     a. Let L be the length property of Target minus the length of A.
+        //     b. Set the length own property of F to either 0 or L, whichever is
+        //       larger.
+        // 16. Else set the length own property of F to 0.
+
+        var boundLength = Math.max(0, target.length - args.length);
+
+        // 17. Set the attributes of the length own property of F to the values
+        //   specified in 15.3.5.1.
+        var boundArgs = [];
+        for (var i = 0; i < boundLength; i++) {
+            boundArgs.push("$" + i);
+        }
+
+        // XXX Build a dynamic function with desired amount of arguments is the only 
+        // way to set the length property of a function. 
+        // In environments where Content Security Policies enabled (Chrome extensions, 
+        // for ex.) all use of eval or Function costructor throws an exception. 
+        // However in all of these environments Function.prototype.bind exists 
+        // and so this code will never be executed.
+        var bound = Function("binder", "return function(" + boundArgs.join(",") + "){return binder.apply(this,arguments)}")(binder);
+
+        if (target.prototype) {
+            Empty.prototype = target.prototype;
+            bound.prototype = new Empty();
+            // Clean up dangling references.
+            Empty.prototype = null;
+        }
+
+        // TODO
+        // 18. Set the [[Extensible]] internal property of F to true.
+
+        // TODO
+        // 19. Let thrower be the [[ThrowTypeError]] function Object (13.2.3).
+        // 20. Call the [[DefineOwnProperty]] internal method of F with
+        //   arguments "caller", PropertyDescriptor {[[Get]]: thrower, [[Set]]:
+        //   thrower, [[Enumerable]]: false, [[Configurable]]: false}, and
+        //   false.
+        // 21. Call the [[DefineOwnProperty]] internal method of F with
+        //   arguments "arguments", PropertyDescriptor {[[Get]]: thrower,
+        //   [[Set]]: thrower, [[Enumerable]]: false, [[Configurable]]: false},
+        //   and false.
+
+        // TODO
+        // NOTE Function objects created using Function.prototype.bind do not
+        // have a prototype property or the [[Code]], [[FormalParameters]], and
+        // [[Scope]] internal properties.
+        // XXX can't delete prototype in pure-js.
+
+        // 22. Return F.
+        return bound;
+    };
+}
+
+// Shortcut to an often accessed properties, in order to avoid multiple
+// dereference that costs universally.
+// _Please note: Shortcuts are defined after `Function.prototype.bind` as we
+// us it in defining shortcuts.
+var call = Function.prototype.call;
+var prototypeOfArray = Array.prototype;
+var prototypeOfObject = Object.prototype;
+var _Array_slice_ = prototypeOfArray.slice;
+// Having a toString local variable name breaks in Opera so use _toString.
+var _toString = call.bind(prototypeOfObject.toString);
+var owns = call.bind(prototypeOfObject.hasOwnProperty);
+
+// If JS engine supports accessors creating shortcuts.
+var defineGetter;
+var defineSetter;
+var lookupGetter;
+var lookupSetter;
+var supportsAccessors;
+if ((supportsAccessors = owns(prototypeOfObject, "__defineGetter__"))) {
+    defineGetter = call.bind(prototypeOfObject.__defineGetter__);
+    defineSetter = call.bind(prototypeOfObject.__defineSetter__);
+    lookupGetter = call.bind(prototypeOfObject.__lookupGetter__);
+    lookupSetter = call.bind(prototypeOfObject.__lookupSetter__);
+}
+
+//
+// Array
+// =====
+//
+
+// ES5 15.4.4.12
+// http://es5.github.com/#x15.4.4.12
+// Default value for second param
+// [bugfix, ielt9, old browsers]
+// IE < 9 bug: [1,2].splice(0).join("") == "" but should be "12"
+if ([1,2].splice(0).length != 2) {
+    var array_splice = Array.prototype.splice;
+    var array_push = Array.prototype.push;
+    var array_unshift = Array.prototype.unshift;
+
+    if (function() { // test IE < 9 to splice bug - see issue #138
+        function makeArray(l) {
+            var a = [];
+            while (l--) {
+                a.unshift(l)
+            }
+            return a
+        }
+
+        var array = []
+            , lengthBefore
+        ;
+
+        array.splice.bind(array, 0, 0).apply(null, makeArray(20));
+        array.splice.bind(array, 0, 0).apply(null, makeArray(26));
+
+        lengthBefore = array.length; //20
+        array.splice(5, 0, "XXX"); // add one element
+
+        if (lengthBefore + 1 == array.length) {
+            return true;// has right splice implementation without bugs
+        }
+        // else {
+        //    IE8 bug
+        // }
+    }()) {//IE 6/7
+        Array.prototype.splice = function(start, deleteCount) {
+            if (!arguments.length) {
+                return [];
+            } else {
+                return array_splice.apply(this, [
+                    start === void 0 ? 0 : start,
+                    deleteCount === void 0 ? (this.length - start) : deleteCount
+                ].concat(_Array_slice_.call(arguments, 2)))
+            }
+        };
+    }
+    else {//IE8
+        Array.prototype.splice = function(start, deleteCount) {
+            var result
+                , args = _Array_slice_.call(arguments, 2)
+                , addElementsCount = args.length
+            ;
+
+            if (!arguments.length) {
+                return [];
+            }
+
+            if (start === void 0) { // default
+                start = 0;
+            }
+            if (deleteCount === void 0) { // default
+                deleteCount = this.length - start;
+            }
+
+            if (addElementsCount > 0) {
+                if (deleteCount <= 0) {
+                    if (start == this.length) { // tiny optimisation #1
+                        array_push.apply(this, args);
+                        return [];
+                    }
+
+                    if (start == 0) { // tiny optimisation #2
+                        array_unshift.apply(this, args);
+                        return [];
+                    }
+                }
+
+                // Array.prototype.splice implementation
+                result = _Array_slice_.call(this, start, start + deleteCount);// delete part
+                args.push.apply(args, _Array_slice_.call(this, start + deleteCount, this.length));// right part
+                args.unshift.apply(args, _Array_slice_.call(this, 0, start));// left part
+
+                // delete all items from this array and replace it to 'left part' + _Array_slice_.call(arguments, 2) + 'right part'
+                args.unshift(0, this.length);
+
+                array_splice.apply(this, args);
+
+                return result;
+            }
+
+            return array_splice.call(this, start, deleteCount);
+        }
+
+    }
+}
+
+// ES5 15.4.4.12
+// http://es5.github.com/#x15.4.4.13
+// Return len+argCount.
+// [bugfix, ielt8]
+// IE < 8 bug: [].unshift(0) == undefined but should be "1"
+if ([].unshift(0) != 1) {
+    var array_unshift = Array.prototype.unshift;
+    Array.prototype.unshift = function() {
+        array_unshift.apply(this, arguments);
+        return this.length;
+    };
+}
+
+// ES5 15.4.3.2
+// http://es5.github.com/#x15.4.3.2
+// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/isArray
+if (!Array.isArray) {
+    Array.isArray = function isArray(obj) {
+        return _toString(obj) == "[object Array]";
+    };
+}
+
+// The IsCallable() check in the Array functions
+// has been replaced with a strict check on the
+// internal class of the object to trap cases where
+// the provided function was actually a regular
+// expression literal, which in V8 and
+// JavaScriptCore is a typeof "function".  Only in
+// V8 are regular expression literals permitted as
+// reduce parameters, so it is desirable in the
+// general case for the shim to match the more
+// strict and common behavior of rejecting regular
+// expressions.
+
+// ES5 15.4.4.18
+// http://es5.github.com/#x15.4.4.18
+// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/array/forEach
+
+// Check failure of by-index access of string characters (IE < 9)
+// and failure of `0 in boxedString` (Rhino)
+var boxedString = Object("a"),
+    splitString = boxedString[0] != "a" || !(0 in boxedString);
+// Check node 0.6.21 bug where third parameter is not boxed
+var boxedForEach = true;
+if (Array.prototype.forEach) {
+    Array.prototype.forEach.call("foo", function(item, i, obj) {
+        if (typeof obj !== 'object') boxedForEach = false;
+    });
+}
+
+if (!Array.prototype.forEach || !boxedForEach) {
+    Array.prototype.forEach = function forEach(fun /*, thisp*/) {
+        var object = toObject(this),
+            self = splitString && _toString(this) == "[object String]" ?
+                this.split("") :
+                object,
+            thisp = arguments[1],
+            i = -1,
+            length = self.length >>> 0;
+
+        // If no callback function or if callback is not a callable function
+        if (_toString(fun) != "[object Function]") {
+            throw new TypeError(); // TODO message
+        }
+
+        while (++i < length) {
+            if (i in self) {
+                // Invoke the callback function with call, passing arguments:
+                // context, property value, property key, thisArg object
+                // context
+                fun.call(thisp, self[i], i, object);
+            }
+        }
+    };
+}
+
+// ES5 15.4.4.19
+// http://es5.github.com/#x15.4.4.19
+// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/map
+if (!Array.prototype.map) {
+    Array.prototype.map = function map(fun /*, thisp*/) {
+        var object = toObject(this),
+            self = splitString && _toString(this) == "[object String]" ?
+                this.split("") :
+                object,
+            length = self.length >>> 0,
+            result = Array(length),
+            thisp = arguments[1];
+
+        // If no callback function or if callback is not a callable function
+        if (_toString(fun) != "[object Function]") {
+            throw new TypeError(fun + " is not a function");
+        }
+
+        for (var i = 0; i < length; i++) {
+            if (i in self)
+                result[i] = fun.call(thisp, self[i], i, object);
+        }
+        return result;
+    };
+}
+
+// ES5 15.4.4.20
+// http://es5.github.com/#x15.4.4.20
+// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/filter
+if (!Array.prototype.filter) {
+    Array.prototype.filter = function filter(fun /*, thisp */) {
+        var object = toObject(this),
+            self = splitString && _toString(this) == "[object String]" ?
+                this.split("") :
+                    object,
+            length = self.length >>> 0,
+            result = [],
+            value,
+            thisp = arguments[1];
+
+        // If no callback function or if callback is not a callable function
+        if (_toString(fun) != "[object Function]") {
+            throw new TypeError(fun + " is not a function");
+        }
+
+        for (var i = 0; i < length; i++) {
+            if (i in self) {
+                value = self[i];
+                if (fun.call(thisp, value, i, object)) {
+                    result.push(value);
+                }
+            }
+        }
+        return result;
+    };
+}
+
+// ES5 15.4.4.16
+// http://es5.github.com/#x15.4.4.16
+// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/every
+if (!Array.prototype.every) {
+    Array.prototype.every = function every(fun /*, thisp */) {
+        var object = toObject(this),
+            self = splitString && _toString(this) == "[object String]" ?
+                this.split("") :
+                object,
+            length = self.length >>> 0,
+            thisp = arguments[1];
+
+        // If no callback function or if callback is not a callable function
+        if (_toString(fun) != "[object Function]") {
+            throw new TypeError(fun + " is not a function");
+        }
+
+        for (var i = 0; i < length; i++) {
+            if (i in self && !fun.call(thisp, self[i], i, object)) {
+                return false;
+            }
+        }
+        return true;
+    };
+}
+
+// ES5 15.4.4.17
+// http://es5.github.com/#x15.4.4.17
+// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/some
+if (!Array.prototype.some) {
+    Array.prototype.some = function some(fun /*, thisp */) {
+        var object = toObject(this),
+            self = splitString && _toString(this) == "[object String]" ?
+                this.split("") :
+                object,
+            length = self.length >>> 0,
+            thisp = arguments[1];
+
+        // If no callback function or if callback is not a callable function
+        if (_toString(fun) != "[object Function]") {
+            throw new TypeError(fun + " is not a function");
+        }
+
+        for (var i = 0; i < length; i++) {
+            if (i in self && fun.call(thisp, self[i], i, object)) {
+                return true;
+            }
+        }
+        return false;
+    };
+}
+
+// ES5 15.4.4.21
+// http://es5.github.com/#x15.4.4.21
+// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/reduce
+if (!Array.prototype.reduce) {
+    Array.prototype.reduce = function reduce(fun /*, initial*/) {
+        var object = toObject(this),
+            self = splitString && _toString(this) == "[object String]" ?
+                this.split("") :
+                object,
+            length = self.length >>> 0;
+
+        // If no callback function or if callback is not a callable function
+        if (_toString(fun) != "[object Function]") {
+            throw new TypeError(fun + " is not a function");
+        }
+
+        // no value to return if no initial value and an empty array
+        if (!length && arguments.length == 1) {
+            throw new TypeError("reduce of empty array with no initial value");
+        }
+
+        var i = 0;
+        var result;
+        if (arguments.length >= 2) {
+            result = arguments[1];
+        } else {
+            do {
+                if (i in self) {
+                    result = self[i++];
+                    break;
+                }
+
+                // if array contains no values, no initial value to return
+                if (++i >= length) {
+                    throw new TypeError("reduce of empty array with no initial value");
+                }
+            } while (true);
+        }
+
+        for (; i < length; i++) {
+            if (i in self) {
+                result = fun.call(void 0, result, self[i], i, object);
+            }
+        }
+
+        return result;
+    };
+}
+
+// ES5 15.4.4.22
+// http://es5.github.com/#x15.4.4.22
+// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/reduceRight
+if (!Array.prototype.reduceRight) {
+    Array.prototype.reduceRight = function reduceRight(fun /*, initial*/) {
+        var object = toObject(this),
+            self = splitString && _toString(this) == "[object String]" ?
+                this.split("") :
+                object,
+            length = self.length >>> 0;
+
+        // If no callback function or if callback is not a callable function
+        if (_toString(fun) != "[object Function]") {
+            throw new TypeError(fun + " is not a function");
+        }
+
+        // no value to return if no initial value, empty array
+        if (!length && arguments.length == 1) {
+            throw new TypeError("reduceRight of empty array with no initial value");
+        }
+
+        var result, i = length - 1;
+        if (arguments.length >= 2) {
+            result = arguments[1];
+        } else {
+            do {
+                if (i in self) {
+                    result = self[i--];
+                    break;
+                }
+
+                // if array contains no values, no initial value to return
+                if (--i < 0) {
+                    throw new TypeError("reduceRight of empty array with no initial value");
+                }
+            } while (true);
+        }
+
+        if (i < 0) {
+            return result;
+        }
+
+        do {
+            if (i in this) {
+                result = fun.call(void 0, result, self[i], i, object);
+            }
+        } while (i--);
+
+        return result;
+    };
+}
+
+// ES5 15.4.4.14
+// http://es5.github.com/#x15.4.4.14
+// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf
+if (!Array.prototype.indexOf || ([0, 1].indexOf(1, 2) != -1)) {
+    Array.prototype.indexOf = function indexOf(sought /*, fromIndex */ ) {
+        var self = splitString && _toString(this) == "[object String]" ?
+                this.split("") :
+                toObject(this),
+            length = self.length >>> 0;
+
+        if (!length) {
+            return -1;
+        }
+
+        var i = 0;
+        if (arguments.length > 1) {
+            i = toInteger(arguments[1]);
+        }
+
+        // handle negative indices
+        i = i >= 0 ? i : Math.max(0, length + i);
+        for (; i < length; i++) {
+            if (i in self && self[i] === sought) {
+                return i;
+            }
+        }
+        return -1;
+    };
+}
+
+// ES5 15.4.4.15
+// http://es5.github.com/#x15.4.4.15
+// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/lastIndexOf
+if (!Array.prototype.lastIndexOf || ([0, 1].lastIndexOf(0, -3) != -1)) {
+    Array.prototype.lastIndexOf = function lastIndexOf(sought /*, fromIndex */) {
+        var self = splitString && _toString(this) == "[object String]" ?
+                this.split("") :
+                toObject(this),
+            length = self.length >>> 0;
+
+        if (!length) {
+            return -1;
+        }
+        var i = length - 1;
+        if (arguments.length > 1) {
+            i = Math.min(i, toInteger(arguments[1]));
+        }
+        // handle negative indices
+        i = i >= 0 ? i : length - Math.abs(i);
+        for (; i >= 0; i--) {
+            if (i in self && sought === self[i]) {
+                return i;
+            }
+        }
+        return -1;
+    };
+}
+
+//
+// Object
+// ======
+//
+
+// ES5 15.2.3.14
+// http://es5.github.com/#x15.2.3.14
+if (!Object.keys) {
+    // http://whattheheadsaid.com/2010/10/a-safer-object-keys-compatibility-implementation
+    var hasDontEnumBug = true,
+        dontEnums = [
+            "toString",
+            "toLocaleString",
+            "valueOf",
+            "hasOwnProperty",
+            "isPrototypeOf",
+            "propertyIsEnumerable",
+            "constructor"
+        ],
+        dontEnumsLength = dontEnums.length;
+
+    for (var key in {"toString": null}) {
+        hasDontEnumBug = false;
+    }
+
+    Object.keys = function keys(object) {
+
+        if (
+            (typeof object != "object" && typeof object != "function") ||
+            object === null
+        ) {
+            throw new TypeError("Object.keys called on a non-object");
+        }
+
+        var keys = [];
+        for (var name in object) {
+            if (owns(object, name)) {
+                keys.push(name);
+            }
+        }
+
+        if (hasDontEnumBug) {
+            for (var i = 0, ii = dontEnumsLength; i < ii; i++) {
+                var dontEnum = dontEnums[i];
+                if (owns(object, dontEnum)) {
+                    keys.push(dontEnum);
+                }
+            }
+        }
+        return keys;
+    };
+
+}
+
+//
+// Date
+// ====
+//
+
+// ES5 15.9.5.43
+// http://es5.github.com/#x15.9.5.43
+// This function returns a String value represent the instance in time
+// represented by this Date object. The format of the String is the Date Time
+// string format defined in 15.9.1.15. All fields are present in the String.
+// The time zone is always UTC, denoted by the suffix Z. If the time value of
+// this object is not a finite Number a RangeError exception is thrown.
+var negativeDate = -62198755200000,
+    negativeYearString = "-000001";
+if (
+    !Date.prototype.toISOString ||
+    (new Date(negativeDate).toISOString().indexOf(negativeYearString) === -1)
+) {
+    Date.prototype.toISOString = function toISOString() {
+        var result, length, value, year, month;
+        if (!isFinite(this)) {
+            throw new RangeError("Date.prototype.toISOString called on non-finite value.");
+        }
+
+        year = this.getUTCFullYear();
+
+        month = this.getUTCMonth();
+        // see https://github.com/es-shims/es5-shim/issues/111
+        year += Math.floor(month / 12);
+        month = (month % 12 + 12) % 12;
+
+        // the date time string format is specified in 15.9.1.15.
+        result = [month + 1, this.getUTCDate(),
+            this.getUTCHours(), this.getUTCMinutes(), this.getUTCSeconds()];
+        year = (
+            (year < 0 ? "-" : (year > 9999 ? "+" : "")) +
+            ("00000" + Math.abs(year))
+            .slice(0 <= year && year <= 9999 ? -4 : -6)
+        );
+
+        length = result.length;
+        while (length--) {
+            value = result[length];
+            // pad months, days, hours, minutes, and seconds to have two
+            // digits.
+            if (value < 10) {
+                result[length] = "0" + value;
+            }
+        }
+        // pad milliseconds to have three digits.
+        return (
+            year + "-" + result.slice(0, 2).join("-") +
+            "T" + result.slice(2).join(":") + "." +
+            ("000" + this.getUTCMilliseconds()).slice(-3) + "Z"
+        );
+    };
+}
+
+
+// ES5 15.9.5.44
+// http://es5.github.com/#x15.9.5.44
+// This function provides a String representation of a Date object for use by
+// JSON.stringify (15.12.3).
+var dateToJSONIsSupported = false;
+try {
+    dateToJSONIsSupported = (
+        Date.prototype.toJSON &&
+        new Date(NaN).toJSON() === null &&
+        new Date(negativeDate).toJSON().indexOf(negativeYearString) !== -1 &&
+        Date.prototype.toJSON.call({ // generic
+            toISOString: function () {
+                return true;
+            }
+        })
+    );
+} catch (e) {
+}
+if (!dateToJSONIsSupported) {
+    Date.prototype.toJSON = function toJSON(key) {
+        // When the toJSON method is called with argument key, the following
+        // steps are taken:
+
+        // 1.  Let O be the result of calling ToObject, giving it the this
+        // value as its argument.
+        // 2. Let tv be toPrimitive(O, hint Number).
+        var o = Object(this),
+            tv = toPrimitive(o),
+            toISO;
+        // 3. If tv is a Number and is not finite, return null.
+        if (typeof tv === "number" && !isFinite(tv)) {
+            return null;
+        }
+        // 4. Let toISO be the result of calling the [[Get]] internal method of
+        // O with argument "toISOString".
+        toISO = o.toISOString;
+        // 5. If IsCallable(toISO) is false, throw a TypeError exception.
+        if (typeof toISO != "function") {
+            throw new TypeError("toISOString property is not callable");
+        }
+        // 6. Return the result of calling the [[Call]] internal method of
+        //  toISO with O as the this value and an empty argument list.
+        return toISO.call(o);
+
+        // NOTE 1 The argument is ignored.
+
+        // NOTE 2 The toJSON function is intentionally generic; it does not
+        // require that its this value be a Date object. Therefore, it can be
+        // transferred to other kinds of objects for use as a method. However,
+        // it does require that any such object have a toISOString method. An
+        // object is free to use the argument key to filter its
+        // stringification.
+    };
+}
+
+// ES5 15.9.4.2
+// http://es5.github.com/#x15.9.4.2
+// based on work shared by Daniel Friesen (dantman)
+// http://gist.github.com/303249
+if (!Date.parse || "Date.parse is buggy") {
+    // XXX global assignment won't work in embeddings that use
+    // an alternate object for the context.
+    Date = (function(NativeDate) {
+
+        // Date.length === 7
+        function Date(Y, M, D, h, m, s, ms) {
+            var length = arguments.length;
+            if (this instanceof NativeDate) {
+                var date = length == 1 && String(Y) === Y ? // isString(Y)
+                    // We explicitly pass it through parse:
+                    new NativeDate(Date.parse(Y)) :
+                    // We have to manually make calls depending on argument
+                    // length here
+                    length >= 7 ? new NativeDate(Y, M, D, h, m, s, ms) :
+                    length >= 6 ? new NativeDate(Y, M, D, h, m, s) :
+                    length >= 5 ? new NativeDate(Y, M, D, h, m) :
+                    length >= 4 ? new NativeDate(Y, M, D, h) :
+                    length >= 3 ? new NativeDate(Y, M, D) :
+                    length >= 2 ? new NativeDate(Y, M) :
+                    length >= 1 ? new NativeDate(Y) :
+                                  new NativeDate();
+                // Prevent mixups with unfixed Date object
+                date.constructor = Date;
+                return date;
+            }
+            return NativeDate.apply(this, arguments);
+        };
+
+        // 15.9.1.15 Date Time String Format.
+        var isoDateExpression = new RegExp("^" +
+            "(\\d{4}|[\+\-]\\d{6})" + // four-digit year capture or sign +
+                                      // 6-digit extended year
+            "(?:-(\\d{2})" + // optional month capture
+            "(?:-(\\d{2})" + // optional day capture
+            "(?:" + // capture hours:minutes:seconds.milliseconds
+                "T(\\d{2})" + // hours capture
+                ":(\\d{2})" + // minutes capture
+                "(?:" + // optional :seconds.milliseconds
+                    ":(\\d{2})" + // seconds capture
+                    "(?:(\\.\\d{1,}))?" + // milliseconds capture
+                ")?" +
+            "(" + // capture UTC offset component
+                "Z|" + // UTC capture
+                "(?:" + // offset specifier +/-hours:minutes
+                    "([-+])" + // sign capture
+                    "(\\d{2})" + // hours offset capture
+                    ":(\\d{2})" + // minutes offset capture
+                ")" +
+            ")?)?)?)?" +
+        "$");
+
+        var months = [
+            0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365
+        ];
+
+        function dayFromMonth(year, month) {
+            var t = month > 1 ? 1 : 0;
+            return (
+                months[month] +
+                Math.floor((year - 1969 + t) / 4) -
+                Math.floor((year - 1901 + t) / 100) +
+                Math.floor((year - 1601 + t) / 400) +
+                365 * (year - 1970)
+            );
+        }
+
+        function toUTC(t) {
+            return Number(new NativeDate(1970, 0, 1, 0, 0, 0, t));
+        }
+
+        // Copy any custom methods a 3rd party library may have added
+        for (var key in NativeDate) {
+            Date[key] = NativeDate[key];
+        }
+
+        // Copy "native" methods explicitly; they may be non-enumerable
+        Date.now = NativeDate.now;
+        Date.UTC = NativeDate.UTC;
+        Date.prototype = NativeDate.prototype;
+        Date.prototype.constructor = Date;
+
+        // Upgrade Date.parse to handle simplified ISO 8601 strings
+        Date.parse = function parse(string) {
+            var match = isoDateExpression.exec(string);
+            if (match) {
+                // parse months, days, hours, minutes, seconds, and milliseconds
+                // provide default values if necessary
+                // parse the UTC offset component
+                var year = Number(match[1]),
+                    month = Number(match[2] || 1) - 1,
+                    day = Number(match[3] || 1) - 1,
+                    hour = Number(match[4] || 0),
+                    minute = Number(match[5] || 0),
+                    second = Number(match[6] || 0),
+                    millisecond = Math.floor(Number(match[7] || 0) * 1000),
+                    // When time zone is missed, local offset should be used
+                    // (ES 5.1 bug)
+                    // see https://bugs.ecmascript.org/show_bug.cgi?id=112
+                    isLocalTime = Boolean(match[4] && !match[8]),
+                    signOffset = match[9] === "-" ? 1 : -1,
+                    hourOffset = Number(match[10] || 0),
+                    minuteOffset = Number(match[11] || 0),
+                    result;
+                if (
+                    hour < (
+                        minute > 0 || second > 0 || millisecond > 0 ?
+                        24 : 25
+                    ) &&
+                    minute < 60 && second < 60 && millisecond < 1000 &&
+                    month > -1 && month < 12 && hourOffset < 24 &&
+                    minuteOffset < 60 && // detect invalid offsets
+                    day > -1 &&
+                    day < (
+                        dayFromMonth(year, month + 1) -
+                        dayFromMonth(year, month)
+                    )
+                ) {
+                    result = (
+                        (dayFromMonth(year, month) + day) * 24 +
+                        hour +
+                        hourOffset * signOffset
+                    ) * 60;
+                    result = (
+                        (result + minute + minuteOffset * signOffset) * 60 +
+                        second
+                    ) * 1000 + millisecond;
+                    if (isLocalTime) {
+                        result = toUTC(result);
+                    }
+                    if (-8.64e15 <= result && result <= 8.64e15) {
+                        return result;
+                    }
+                }
+                return NaN;
+            }
+            return NativeDate.parse.apply(this, arguments);
+        };
+
+        return Date;
+    })(Date);
+}
+
+// ES5 15.9.4.4
+// http://es5.github.com/#x15.9.4.4
+if (!Date.now) {
+    Date.now = function now() {
+        return new Date().getTime();
+    };
+}
+
+
+//
+// Number
+// ======
+//
+
+// ES5.1 15.7.4.5
+// http://es5.github.com/#x15.7.4.5
+if (!Number.prototype.toFixed || (0.00008).toFixed(3) !== '0.000' || (0.9).toFixed(0) === '0' || (1.255).toFixed(2) !== '1.25' || (1000000000000000128).toFixed(0) !== "1000000000000000128") {
+    // Hide these variables and functions
+    (function () {
+        var base, size, data, i;
+
+        base = 1e7;
+        size = 6;
+        data = [0, 0, 0, 0, 0, 0];
+
+        function multiply(n, c) {
+            var i = -1;
+            while (++i < size) {
+                c += n * data[i];
+                data[i] = c % base;
+                c = Math.floor(c / base);
+            }
+        }
+
+        function divide(n) {
+            var i = size, c = 0;
+            while (--i >= 0) {
+                c += data[i];
+                data[i] = Math.floor(c / n);
+                c = (c % n) * base;
+            }
+        }
+
+        function toString() {
+            var i = size;
+            var s = '';
+            while (--i >= 0) {
+                if (s !== '' || i === 0 || data[i] !== 0) {
+                    var t = String(data[i]);
+                    if (s === '') {
+                        s = t;
+                    } else {
+                        s += '0000000'.slice(0, 7 - t.length) + t;
+                    }
+                }
+            }
+            return s;
+        }
+
+        function pow(x, n, acc) {
+            return (n === 0 ? acc : (n % 2 === 1 ? pow(x, n - 1, acc * x) : pow(x * x, n / 2, acc)));
+        }
+
+        function log(x) {
+            var n = 0;
+            while (x >= 4096) {
+                n += 12;
+                x /= 4096;
+            }
+            while (x >= 2) {
+                n += 1;
+                x /= 2;
+            }
+            return n;
+        }
+
+        Number.prototype.toFixed = function (fractionDigits) {
+            var f, x, s, m, e, z, j, k;
+
+            // Test for NaN and round fractionDigits down
+            f = Number(fractionDigits);
+            f = f !== f ? 0 : Math.floor(f);
+
+            if (f < 0 || f > 20) {
+                throw new RangeError("Number.toFixed called with invalid number of decimals");
+            }
+
+            x = Number(this);
+
+            // Test for NaN
+            if (x !== x) {
+                return "NaN";
+            }
+
+            // If it is too big or small, return the string value of the number
+            if (x <= -1e21 || x >= 1e21) {
+                return String(x);
+            }
+
+            s = "";
+
+            if (x < 0) {
+                s = "-";
+                x = -x;
+            }
+
+            m = "0";
+
+            if (x > 1e-21) {
+                // 1e-21 < x < 1e21
+                // -70 < log2(x) < 70
+                e = log(x * pow(2, 69, 1)) - 69;
+                z = (e < 0 ? x * pow(2, -e, 1) : x / pow(2, e, 1));
+                z *= 0x10000000000000; // Math.pow(2, 52);
+                e = 52 - e;
+
+                // -18 < e < 122
+                // x = z / 2 ^ e
+                if (e > 0) {
+                    multiply(0, z);
+                    j = f;
+
+                    while (j >= 7) {
+                        multiply(1e7, 0);
+                        j -= 7;
+                    }
+
+                    multiply(pow(10, j, 1), 0);
+                    j = e - 1;
+
+                    while (j >= 23) {
+                        divide(1 << 23);
+                        j -= 23;
+                    }
+
+                    divide(1 << j);
+                    multiply(1, 1);
+                    divide(2);
+                    m = toString();
+                } else {
+                    multiply(0, z);
+                    multiply(1 << (-e), 0);
+                    m = toString() + '0.00000000000000000000'.slice(2, 2 + f);
+                }
+            }
+
+            if (f > 0) {
+                k = m.length;
+
+                if (k <= f) {
+                    m = s + '0.0000000000000000000'.slice(0, f - k + 2) + m;
+                } else {
+                    m = s + m.slice(0, k - f) + '.' + m.slice(k - f);
+                }
+            } else {
+                m = s + m;
+            }
+
+            return m;
+        }
+    }());
+}
+
+
+//
+// String
+// ======
+//
+
+
+// ES5 15.5.4.14
+// http://es5.github.com/#x15.5.4.14
+
+// [bugfix, IE lt 9, firefox 4, Konqueror, Opera, obscure browsers]
+// Many browsers do not split properly with regular expressions or they
+// do not perform the split correctly under obscure conditions.
+// See http://blog.stevenlevithan.com/archives/cross-browser-split
+// I've tested in many browsers and this seems to cover the deviant ones:
+//    'ab'.split(/(?:ab)*/) should be ["", ""], not [""]
+//    '.'.split(/(.?)(.?)/) should be ["", ".", "", ""], not ["", ""]
+//    'tesst'.split(/(s)*/) should be ["t", undefined, "e", "s", "t"], not
+//       [undefined, "t", undefined, "e", ...]
+//    ''.split(/.?/) should be [], not [""]
+//    '.'.split(/()()/) should be ["."], not ["", "", "."]
+
+var string_split = String.prototype.split;
+if (
+    'ab'.split(/(?:ab)*/).length !== 2 ||
+    '.'.split(/(.?)(.?)/).length !== 4 ||
+    'tesst'.split(/(s)*/)[1] === "t" ||
+    ''.split(/.?/).length ||
+    '.'.split(/()()/).length > 1
+) {
+    (function () {
+        var compliantExecNpcg = /()??/.exec("")[1] === void 0; // NPCG: nonparticipating capturing group
+
+        String.prototype.split = function (separator, limit) {
+            var string = this;
+            if (separator === void 0 && limit === 0)
+                return [];
+
+            // If `separator` is not a regex, use native split
+            if (Object.prototype.toString.call(separator) !== "[object RegExp]") {
+                return string_split.apply(this, arguments);
+            }
+
+            var output = [],
+                flags = (separator.ignoreCase ? "i" : "") +
+                        (separator.multiline  ? "m" : "") +
+                        (separator.extended   ? "x" : "") + // Proposed for ES6
+                        (separator.sticky     ? "y" : ""), // Firefox 3+
+                lastLastIndex = 0,
+                // Make `global` and avoid `lastIndex` issues by working with a copy
+                separator = new RegExp(separator.source, flags + "g"),
+                separator2, match, lastIndex, lastLength;
+            string += ""; // Type-convert
+            if (!compliantExecNpcg) {
+                // Doesn't need flags gy, but they don't hurt
+                separator2 = new RegExp("^" + separator.source + "$(?!\\s)", flags);
+            }
+            /* Values for `limit`, per the spec:
+             * If undefined: 4294967295 // Math.pow(2, 32) - 1
+             * If 0, Infinity, or NaN: 0
+             * If positive number: limit = Math.floor(limit); if (limit > 4294967295) limit -= 4294967296;
+             * If negative number: 4294967296 - Math.floor(Math.abs(limit))
+             * If other: Type-convert, then use the above rules
+             */
+            limit = limit === void 0 ?
+                -1 >>> 0 : // Math.pow(2, 32) - 1
+                limit >>> 0; // ToUint32(limit)
+            while (match = separator.exec(string)) {
+                // `separator.lastIndex` is not reliable cross-browser
+                lastIndex = match.index + match[0].length;
+                if (lastIndex > lastLastIndex) {
+                    output.push(string.slice(lastLastIndex, match.index));
+                    // Fix browsers whose `exec` methods don't consistently return `undefined` for
+                    // nonparticipating capturing groups
+                    if (!compliantExecNpcg && match.length > 1) {
+                        match[0].replace(separator2, function () {
+                            for (var i = 1; i < arguments.length - 2; i++) {
+                                if (arguments[i] === void 0) {
+                                    match[i] = void 0;
+                                }
+                            }
+                        });
+                    }
+                    if (match.length > 1 && match.index < string.length) {
+                        Array.prototype.push.apply(output, match.slice(1));
+                    }
+                    lastLength = match[0].length;
+                    lastLastIndex = lastIndex;
+                    if (output.length >= limit) {
+                        break;
+                    }
+                }
+                if (separator.lastIndex === match.index) {
+                    separator.lastIndex++; // Avoid an infinite loop
+                }
+            }
+            if (lastLastIndex === string.length) {
+                if (lastLength || !separator.test("")) {
+                    output.push("");
+                }
+            } else {
+                output.push(string.slice(lastLastIndex));
+            }
+            return output.length > limit ? output.slice(0, limit) : output;
+        };
+    }());
+
+// [bugfix, chrome]
+// If separator is undefined, then the result array contains just one String,
+// which is the this value (converted to a String). If limit is not undefined,
+// then the output array is truncated so that it contains no more than limit
+// elements.
+// "0".split(undefined, 0) -> []
+} else if ("0".split(void 0, 0).length) {
+    String.prototype.split = function(separator, limit) {
+        if (separator === void 0 && limit === 0) return [];
+        return string_split.apply(this, arguments);
+    }
+}
+
+
+// ECMA-262, 3rd B.2.3
+// Note an ECMAScript standart, although ECMAScript 3rd Edition has a
+// non-normative section suggesting uniform semantics and it should be
+// normalized across all browsers
+// [bugfix, IE lt 9] IE < 9 substr() with negative value not working in IE
+if ("".substr && "0b".substr(-1) !== "b") {
+    var string_substr = String.prototype.substr;
+    /**
+     *  Get the substring of a string
+     *  @param  {integer}  start   where to start the substring
+     *  @param  {integer}  length  how many characters to return
+     *  @return {string}
+     */
+    String.prototype.substr = function(start, length) {
+        return string_substr.call(
+            this,
+            start < 0 ? ((start = this.length + start) < 0 ? 0 : start) : start,
+            length
+        );
+    }
+}
+
+// ES5 15.5.4.20
+// http://es5.github.com/#x15.5.4.20
+var ws = "\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003" +
+    "\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028" +
+    "\u2029\uFEFF";
+if (!String.prototype.trim || ws.trim()) {
+    // http://blog.stevenlevithan.com/archives/faster-trim-javascript
+    // http://perfectionkills.com/whitespace-deviations/
+    ws = "[" + ws + "]";
+    var trimBeginRegexp = new RegExp("^" + ws + ws + "*"),
+        trimEndRegexp = new RegExp(ws + ws + "*$");
+    String.prototype.trim = function trim() {
+        if (this === void 0 || this === null) {
+            throw new TypeError("can't convert "+this+" to object");
+        }
+        return String(this)
+            .replace(trimBeginRegexp, "")
+            .replace(trimEndRegexp, "");
+    };
+}
+
+//
+// Util
+// ======
+//
+
+// ES5 9.4
+// http://es5.github.com/#x9.4
+// http://jsperf.com/to-integer
+
+function toInteger(n) {
+    n = +n;
+    if (n !== n) { // isNaN
+        n = 0;
+    } else if (n !== 0 && n !== (1/0) && n !== -(1/0)) {
+        n = (n > 0 || -1) * Math.floor(Math.abs(n));
+    }
+    return n;
+}
+
+function isPrimitive(input) {
+    var type = typeof input;
+    return (
+        input === null ||
+        type === "undefined" ||
+        type === "boolean" ||
+        type === "number" ||
+        type === "string"
+    );
+}
+
+function toPrimitive(input) {
+    var val, valueOf, toString;
+    if (isPrimitive(input)) {
+        return input;
+    }
+    valueOf = input.valueOf;
+    if (typeof valueOf === "function") {
+        val = valueOf.call(input);
+        if (isPrimitive(val)) {
+            return val;
+        }
+    }
+    toString = input.toString;
+    if (typeof toString === "function") {
+        val = toString.call(input);
+        if (isPrimitive(val)) {
+            return val;
+        }
+    }
+    throw new TypeError();
+}
+
+// ES5 9.9
+// http://es5.github.com/#x9.9
+var toObject = function (o) {
+    if (o == null) { // this matches both null and undefined
+        throw new TypeError("can't convert "+o+" to object");
+    }
+    return Object(o);
+};
+
+});
diff --git a/_layouts/default.html b/_layouts/default.html
index dfafaa02..501ad3db 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -1,4 +1,5 @@
 <!DOCTYPE html>
+<!--[if IE]><![endif]-->
 <html>
 <head>
   <meta charset="utf-8">
@@ -22,6 +23,10 @@
   <script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script>
   <script type="text/javascript">try{Typekit.load();}catch(e){}</script>
 
+  <!--[if lte IE 8]>
+  <script type="text/javascript" src="/react/js/es5-shim.js"></script>
+  <script type="text/javascript" src="/react/js/es5-sham.js"></script>
+  <![endif]-->
   <script type="text/javascript" src="/react/js/codemirror.js"></script>
   <script type="text/javascript" src="/react/js/javascript.js"></script>
   <script type="text/javascript" src="/react/js/react.min.js"></script>