BK-759 Implement Collection class for JavaScript editor interface
BK-760 Include Underscore JavaScript library
BK-761 Convert some of the functionality to use Underscore library
BK-762 Media tab in the editing interface
BK-763 Wrong Aloha configuration is crashing interface
BK-764 Editor interface more configurable
BK-765 The convert view is CSRF exempt
Merged with upstream branch