Feature (REST): Added screen_name and user_id attributes to direct_messages/new for disambiguation (issue 550, documentation)

Feature (REST): Added new friendships/show method (issue 474, documentation)

Fixed (REST): Partially fixed issue with tiling background images via the API (issue 650)

Fixed (OAuth): Added a more helpful error message when you try to use a request token in place of an access token.

Fixed (OAuth): Improved error handling when invalid data is submitted in place of a token.

Fixed (REST): The JSON returned in maintenance mode now correctly contains null rather than NULL (issue 703)

Fixed (Mail): Improved outbound email reliability (for apps parsing DM/friend emails)