Added TypePrefixes enum to list possible Types from the Reddit API.
Added MessageMapper class to deal in a single place with converting JSON objects to Message instances.
Small refactorings to the Message fields
Removed printing of response for GET calls
Implemented read/unread message functionality and added unit tests for them
Merged branch 'raul' into karan (master)
Merge pull request #22 from RaulLepsa/karan

Raul