Bugfix: JWplayer preview in S3 existing videos list
Bugfix for loading jQuery i iFrame file media_manager_insert_video.php. Now it loads jQuery through CDN in stead of the hardcoded way of loading WordPress' load-scripts.php?.. (can only load newer jQuery version when the colorbox plugin shipped with S3 is updated and vice-versa, due to deprecated -> removed jQuery.live() method)