Added content descriptions to fix warnings.
Fixed commenting style to maintain consistency. Fixed warnings and fully
implemented the java coding style.
Fixed more discrepancies with java/android coding conventions.
Fixed broken commit
Added Sounds class to play sound files.
Added in basic collision detection for tanks/environment.
Lots of updates:

Added in bullet collisions.
Implemented sounds on collisions.
Added in health system.
Fixed hit boxes and sped up display.
Various fixes
Updates
Hitbox fixes
Cleaned up some code
Updated sleep
Thomas's code from the fork.