2) Removed UnauthorizedException as a thrown exception in methods that was being used for ACL.
3) Adds last known room's subject to the room's history after the room was loaded from the DB.


git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@487 b35dd754-fafc-0310-a699-88a17e54d16e