Patch to allow CollisionSegment into CollisionBox test

I found this combination was mysteriously missing, so here it is.
http://drop.io/pdw5qoc
I do a lot of short-range ray tests, and measuring with pstats I got about a 25% speed improvement over using CollisionRay. It could probably be sped up even more but good enough for my purposes.

Great, thanks! Integrated.

David