Removed unneded inheritance code from UTF8Loader. Fixes #1343.

src/extras/loaders/UTF8Loader.js

@@ -13,29 +13,17 @@
  * @author won3d / http://twitter.com/won3d
  */
 
-THREE.UTF8Loader = function () {
+THREE.UTF8Loader = function () {};
 
-};
-
-THREE.UTF8Loader.prototype = new THREE.UTF8Loader();
-THREE.UTF8Loader.prototype.constructor = THREE.UTF8Loader;
-
-
-// Load UTF8 compressed models generated by objcompress
-//  - parameters
-//		- url (required)
-//		- callback (required)
-//		- metaData (optional)
-
-THREE.UTF8Loader.prototype.load = function ( url, callback, metaData ) {
+THREE.UTF8Loader.prototype.load = function ( url, callback, metadata ) {
 
 	var xhr = new XMLHttpRequest(),
 		callbackProgress = null,
 
-		scale = metaData.scale !== undefined ? metaData.scale : 1,
-		offsetX = metaData.offsetX !== undefined ? metaData.offsetX : 0,
-		offsetY = metaData.offsetY !== undefined ? metaData.offsetY : 0,
-		offsetZ = metaData.offsetZ !== undefined ? metaData.offsetZ : 0;
+		scale = metadata.scale !== undefined ? metadata.scale : 1,
+		offsetX = metadata.offsetX !== undefined ? metadata.offsetX : 0,
+		offsetY = metadata.offsetY !== undefined ? metadata.offsetY : 0,
+		offsetZ = metadata.offsetZ !== undefined ? metadata.offsetZ : 0;
 
 	var length = 0;