Physics Screen, basic Box2D, Camera stuff.
Cleanup and additional Physics testing stuff.
Entity and TestEntity working with test PhysicsScreen.
Lots of additions to Entity and physics testing. Most notably, states (need refinement).
Added .gitignore file.
Removed second README file.
Removed java binaries from version control.
Removed Player and Descriptor classes as they're no longer needed.
Merge branch 'physics-test'