Added constructor to UserIdentifier to take single string (user@domain)
Updated UserIdentifier tests to test the new constructor

ACE-92
Created base InviteController. May need revision with progress

ACE-92
Added comments ACE-92
Added constructor to UserIdentifier to take single string (user@domain)
Updated UserIdentifier tests to test the new constructor

ACE-92
Created base InviteController. May need revision with progress

ACE-92
Actually added comments ACE-92
Added Exception catching for non-existent users
Fixed typo
Merge branch 'createSpringPostControllerToHandleInvite_ACE-92' of
https://github.com/ualerts-org/ualerts-chat into
createSpringPostControllerToHandleInvite_ACE-92

Conflicts:
	org.ualerts.chat.web/src/main/java/org/ualerts/chat/web/controller/InviteController.java
Cleaned up try/catch block
Updated tests to check for exceptions with annotations (thanks, Brian)
ACE-92
Merge pull request #53 from ualerts-org/createSpringPostControllerToHandleInvite_ACE-92

Create spring post controller to handle invite ace 92