Merge pull request #51 from Livefyre/dev

Properly handle deletion errors
Merge branch 'master' of github.com:Livefyre/StreamHub-iOS-Example-App into dev
Modify cell visibility policy
Pop detail view controller from navigation stack after reply

Once a user replied to a comment in detail view, he/she is
probably interested in seeing the reply as a part of the conversation,
so we slide out the detail view once posting succeeds.