** Added support for changing nickname in Illusion group
** Changed nickname property of IllusionGroupUser to be not-null and
not-empty
** Added method for updating IllusionGroupUser nickname into
IllusionGroupController
** Added support for saving user nickname in Illusion group
** Fixed entity name in IllusionGroupUserDAO
** Added entity for Illusion group user image
** Added inital draft of avatar changing dialog into Illusion group
** Added support for updating Illusion group avatar
** Added binaryajax and exif javascript libraries
** Added support for checking exif orientation and rotating image by
according it into image dialog