onlyUniqueMessages gets tripped up by rapidly triggered notifications

[soumya92]

Since the check for unique messages is in the main event loop, but the actual addition of the message is in a $timeout(...), sometimes I have as many as three of the same message get added to the list, since the first two $timeouts(...) did not trigger in time.

I'm not sure why there is a $timeout(...) in addMessage to begin with, but if there's a reason for it, then should the check for uniqueMessages be moved to within addMessage itself?