Avoid auto-scroll after deleting a message

See WhisperSystems/TextSecure#139

This fix involves setting transcriptMode to normal on conversation view,
which resolves the issue but comes with the side effect that if you
have scrolled away from the bottom of the list, new incoming messages
will not trigger auto-scroll as they arrive.
Fix for viewing group recipients without contact information.
Minor spelling correction.
Merge branch 'issue139' of https://github.com/liliakai/TextSecure into no_conversation_scroll
Fix for MMS send bug with an APN proxy.
Modern-style Android chat icons (incl. secure icon)

Make the send-button appearance more similar to the default Android
messenger application