New conversation modal submits upon return key press

ACE-95
Modal for invite now submits upon return key press.

ACE-95
Invite modal's #ivitee-username field gets focus when modal is shown.

ACE-95
Working on new chatroom messages
Refactored SockJsHandler handleTextMessage() to take into accout the
'to' domain when building a UserIdentifier for conversation search.
Refactored ChatRoomViewController, HiddenChatRoomViewController,
PageContoller, and RemoteService to handle chatroom chats (all).
Merge pull request #58 from ualerts-org/handleInviteAcceptance_ACE-95

Handle invite acceptance ace 95