Added NDK to build.
Added Bullet.
Added Body to GameObject.
Added getters and setters for Quaternion.
Added Body wrapper for btRigidBody.
Added PhysicsWorld wrapper for btDiscreteDynamicsWorld.
Added basic interface for btCollisionShapes.
Added wrapper for btCompoundShape.
Added basic collision shapes.
Removed unused import.
Removed useless application from manifest.
Moved library loading to the Game class.
Added necessary Java generics tags.
Changed Quaternion multiplication for proper RHS coordinate system.
Rotation matrix multiplication was not computed properly.
Changed camera pitch/yaw rotation to take advantage of the new RHS quternion implementation.
Added missing superconstructor call.
Added another constructor to the Model class to make efficient object duplication possible.
The direational light world should not compute the shadow mapping matrices unless it has a directional light attached.