Updated Code!

Alright, I have upload a bunch of changes to the dynamics directory, including (but not limited to because I'm probably forgetting something):
- more comments!
- Fixes for some incorrect rotations I was doing (bugs)
- Added center of gravity to Vehicle
- Collisions can now impart angular velocities on other vehicles!
- The collision code has been further tested, and now imparts a force to change the velocity rather than changing the velocity immediately.

Jase is currently working on bitmaps. We hope to have the dynamics and graphics engine talking soon so we can start having bouncing balls..or something. Hey, it's a start ;).