Hide Bullet dependency by making PhysicsMotionState private.
Refix due to accidental revert of 9b5424f566.
Merge pull request #730 from seanpaultaylor/next

Updated GamepadTest and PS3 mappings
Merge pull request #729 from kwhatmough/next

Refix an accidental revert, and hide Bullet classes from public API
Update brick and brick normal for LightTest.