Added Circle shape class for physics.
Improved physics engine.
Better source tree
Integrated PhysicsService in whole system (Collisions not tested yet, but the game have same functionality as before using the new system)
Added new assets and organized them
Added background to main menu
Fixed main menu button color scheme
Improved physics engine.
Fixed wrong merge resolution
Integrated PhysicsService in whole system (Collisions not tested yet, but the game have same functionality as before using the new system)
Changed sprite to getters/setters
Merge remote-tracking branch 'upstream/master'

Conflicts:
	jni/Physics/PObject.cpp
	jni/Physics/PhysicsService.cpp
Merge remote-tracking branch 'upstream/master'..
Merge pull request #8 from mike96/master

Merge day!