Begun implementation of Box2D

Signed-off-by: fad4470 <fad4470@rit.edu>
First traces of a functioning Box2D implementation.

Signed-off-by: fad4470 <fad4470@rit.edu>
Merge branch 'Box2DDev'

Conflicts:
	Racer/BuildingLayer.as
	Racer/Cop.as
	Racer/GameScreen.as
	Racer/Main.as
	Racer/Player.as

Signed-off-by: fad4470 <fad4470@rit.edu>
Implemented missing method from Box2D's C version (ApplyAngularImpulse)

Signed-off-by: fad4470 <fad4470@rit.edu>
Begun work on Player's new physical controls.

Signed-off-by: fad4470 <fad4470@rit.edu>
Merge branch 'master' of https://github.com/fad4470/GDD-Racer

Conflicts:
	Racer/GameScreen.as

Signed-off-by: fad4470 <fad4470@rit.edu>
Reorganized class heirarchy for physics-based objects. Cop not implemented.

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