Refactored to follow naming convention

renamed all activity classes to title_activity. my package is getting a
little crowded so it will help me differentiate them from other classes.
SMS committed to database only upon send success

Fixed a bug where SMS messages were committed to the sent database
whether the send was successful or not.
Conversation thread is updated when msg is sent

When in the conversation view, sent messages are added to the thread
upon successful send. This is done through a receiver that is
initialized in onResume and detached in onPause so if you navigate out
of the conversation view before your message is sent it doesn't trigger.
Unfortunately, the message is added to the sent databse by the same
receiver, so if the user leaves the conversation view the message
doesn't get added to the database. Will fix this later.