Memory Leak Hotfix

I don't know if I'm going to have time before Tuesday to continue to work on this, but as it stands the program now runs for at least 45 minutes (still running as a type this).  However, it does start chugging after a while, but looking at documentation that might be a intrinsic problem with the library.

I made sure to clear every extra b2Vec2 we were using for force calculation and updating the transforms.