ImageLoader - Release Notes

2.5.2
   * No Change

2.5.1
   * No Change

2.5.0
   * Group object has an addCustomTrigger() function for adding custom event triggers
   * PNG background images now support custom properties for AlphaImageLoader

2.4.0
   * No Change

2.3.1
   * No Change

2.3.0
   * Initial release
