Housekeeping and refactoring:
 - better game architecure added based on one presented in (Begining Android Games 2nd edition book):
   x) Interfaces created for file i/o
   x) Interfaces created for audio, music sounds
   x) Interfaces for input created Single touch, multi touch, accelerometer, compass
   x) Implementation of file io
   x) Implementation of audio, music, sound
   x) Implementation of input handling
   x) Interfaces for Game Screen created
   x) Interfaces for Game Created
   x) Implemenation of Abstract game created
   x) Implementation of Simple Screen created

 - removed unnecessary activity from manifest