Fixes message sending + Notification improvements + Layout fixes + Data Cleanup + Removing contacts

Fixes lots of bugs in message sending
-Sent messages are stored and displayed
-Message list updates when message is sent
-Pending intent in notification to launch Chat Activity is corrected

Improves the layout of the Chat Thread
-Contact name in action bar
-Chat bubbles are dynamic in size
-Eliminated timestamps in chat bubble (for now)
-Chat thread automatically scrolls to the bottom

Data Cleanup
-Adds an option to cleanup stray unused data
-Cleanup runs automatically if any contact is removed

Removing individual contacts
-Long click on contact provides option to remove contact

Notification Improvement
-Notification light support
-Default sound and vibrate