Bring in jsfiddle integration script, add harmony

_js/jsfiddle-integration.js

@@ -0,0 +1,11 @@
+(function() {
+  var tag = document.querySelector(
+    'script[type="application/javascript;version=1.7"]'
+  );
+  if (!tag || tag.textContent.indexOf('window.onload=function(){') !== -1) {
+    alert('Bad JSFiddle configuration, please fork the original React JSFiddle');
+  }
+  tag.setAttribute('type', 'text/jsx;harmony=true');
+  tag.textContent = tag.textContent.replace(/^\/\/<!\[CDATA\[/, '');
+})();
+