code: function ImageLoader(url, crossorigin)
  {
      EventTarget.call(this);
  
      /**
       * The texture being loaded
       *
       * @property texture
       * @type Texture
       */
      this.texture = Texture.fromImage(url, crossorigin);
  
      /**
       * if the image is loaded with loadFramedSpriteSheet
       * frames will contain the sprite sheet frames
       *
       */
      this.frames = [];
  }
docs: The image loader class is responsible for loading images file formats ("jpeg", "jpg", "png" and "gif")
  Once the image has been loaded it is stored in the texture cache and can be accessed though Texture.fromFrameId() and Sprite.fromFromeId()
  When loaded this class will dispatch a 'loaded' event
  
  @class ImageLoader
  @uses EventTarget
  @constructor
  @param url {String} The url of the image
  @param crossorigin {Boolean} Whether requests should be treated as crossorigin