code: function inflate(rect, w, h) {
        return create(rect.x - w, rect.y - h, rect.w + w * 2, rect.h + h * 2);
      }
docs: Inflates the rect in all directions.
  
  @method inflate
  @param {Rect} rect Rect to expand.
  @param {Number} w Relative width to expand by.
  @param {Number} h Relative height to expand by.
  @return {Rect} New expanded rect.