make possible to insert a source html code to editor

js/ckeditor.editor.js

@@ -23,6 +23,9 @@ document.addEventListener('DOMContentLoaded', function() {
       { name: 'clipboard', items: [ 'Cut','Copy','Paste','PasteText','PasteFromWord'] },
 		],
 
+    // Allow paste source code
+    allowedContent: true,
+
 		// Since we define all configuration options here, let's instruct CKEditor to not load config.js which it does by default.
 		// One HTTP request less will result in a faster startup time.
 		// For more information check http://docs.ckeditor.com/#!/api/CKEDITOR.config-cfg-customConfig