Cache vertices on asteroids
Only do collision checks when AABB's overlap
Fix Separating Axis collision tests

* Compare all axes along all edges, always. This appears to give better
  collision results.
* Calculate the direction of the min axis after it's found so it's always
  pointing in the correct direction (A->B)
* Add minAxis debugging, and reenable the rest of it too
dat.GUI and a restartable world simulation