Format JSON for inspecting objects

This patch enables formatting for inspecting JSON objects. Example:

p({foo: "bar", deep: {foo: "bar"}})

becomes:

{
 "foo": "bar",
 "deep": {
  "foo": "bar"
 }
}

lib/sys.js

@@ -28,7 +28,7 @@ exports.inspect = function (value) {
   if (value === undefined) return;
   
   try {
-    return JSON.stringify(value);
+    return JSON.stringify(value, undefined, 1);
   } catch (e) {
     // TODO make this recusrive and do a partial JSON output of object.
     if (e.message.search("circular")) {