Added Box2d. Not implemented.

Signed-off-by: fad4470 <fad4470@rit.edu>
Merge branch 'master' of https://github.com/fad4470/GDD-Racer
Disabled requirement for a background movieclip (but you can still have it)

Signed-off-by: fad4470 <fad4470@rit.edu>
Fixed camera again.

Signed-off-by: fad4470 <fad4470@rit.edu>