Add collision response between AABBs.

[mdkess]

Another thing that could be interesting would be legit collision response between AABBs. Metanet has a good tutorial on how this works. It does have the possibility of leading to bugs/glitches, since certain physics situations are unsolvable.

Metanet has a good tutorial on this sort of thing (and much more advanced collision detection) http://www.metanetsoftware.com/technique.html