decoupling messages from user, adding Offline status when user is offline
Made changes according to comments, now user is added to private messages only when they send a message
Removing unused injection, fixing small bugs related to the 'offline' marker
fixing 'count of the new messages should reset, when user is inside chat' plus fixing additional bugs
renaming and unsubscribe deactivate handler
Merge pull request #9 from SenecaCDOT-BigBlueButton/chat-message-decouple

decoupling messages from user, adding Offline status when user is offlin...