sync changes from shared files

Author: varyndev

src/createjs/utils/extend.js

@@ -48,7 +48,7 @@ this.createjs = this.createjs||{};
  *
  * 	var foo = new MySubClass();
  * 	console.log(foo instanceof MySuperClass); // true
- * 	console.log(foo.prototype.constructor === MySubClass); // true
+ * 	console.log(Object.getPrototypeOf(foo).constructor === MySubClass); // true
  *
  * @method extend
  * @param {Function} subclass The subclass.

src/preloadjs/loaders/AbstractMediaLoader.js

@@ -70,6 +70,12 @@ this.createjs = this.createjs || {};
 			this._tag = this._createTag(this._item.src);
 		}
 
+		var crossOrigin = this._item.crossOrigin;
+		if (crossOrigin === true) { crossOrigin = "Anonymous"; }
+		if (crossOrigin != null && !createjs.URLUtils.isLocal(this._item)) {
+			this._tag.crossOrigin = crossOrigin;
+		}
+
 		this._tag.preload = "auto";
 		this._tag.load();
 

src/preloadjs/utils/RequestUtils.js

@@ -108,6 +108,7 @@
 			case "ogg":
 			case "mp3":
 			case "webm":
+			case "aac":
 				return createjs.Types.SOUND;
 			case "mp4":
 			case "webm":