Add support for using Drupal's Ajax Framework for returning content into Lightbox (Colorbox)

Drupal's Ajax Framework supports lazy loading of js/css/library files, using it would enable embedding video players (without using iframes, afaik iframes are disabled in the Colorboxes that Media Gallery create, because the nice auto sizing feature is not working with iframes) that need their corresponding .js files loaded after content loaded. One example would be the 'Brightcove integration' module we are working on. It has Media integration and through that partial Media Gallery integration too. We miss the Lightbox support because of the issue mentioned above.