Tweaking physics and level layout. Demonstrating a glitch.
Added a makeshift test for bumper sticking problem.
Refactored main loop into its own function.
Updating notes.
Temporarily changing to dvorak controls.
Added frame skipping so we keep the physics frames consistent even if the display frames are not.
Changed the way restitution is handled. Fixed the stuck-in-bumper bug, with unittest.
Added a basic test on elastic collisions.