Refactored RigidBody.py so that mass is now a function of state, rather than a state variable itself.  This particular change is so that we can have different constituent mass components (separate fuel tanks, for example).
Refactored RigidBody.py so that mass is now a function of state, rather than a state variable itself.  This particular change is so that we can have different constituent mass components (separate fuel tanks, for example).

pchokanson/atlas-sim