code: function scale(x, y) {
           var _x = x,
               _y = typeof y === "undefined" ? _x : y; // set the scaleFlag
  
  
           this.currentTransform.scale(_x, _y); // resize the bounding box
  
           this.getBounds().resize(this.width * _x, this.height * _y);
           return this;
         }
docs: scale the renderable around his anchor point.  Scaling actually applies changes
  to the currentTransform member wich is used by the renderer to scale the object
  when rendering.  It does not scale the object itself.  For example if the renderable
  is an image, the image.width and image.height properties are unaltered but the currentTransform
  member will be changed.
  @name scale
  @memberOf me.Renderable.prototype
  @function
  @param {Number} x a number representing the abscissa of the scaling vector.
  @param {Number} [y=x] a number representing the ordinate of the scaling vector.
  @return {me.Renderable} Reference to this object for method chaining