Merge pull request #7 from blee92/master

APK File
Adding RealTalk apk that uses debugging key
Merge pull request #12 from colinkho/master

Adding APK with debugging key.
Added skeleton classes for DB-App interface
added packages
refactored "login" to incorporate ChatManager
skeleton addUser method
changing the layout to suit testing addUser
Authenticate method in ChatManager

Added support for authentication in ChatManager class
Merge pull request #1 from realtalk403/master

Pull