tube in game, with basic camera following
naive collisions in world via ICollidable
virtualized the interface and added bounding sphere
got collisions working
Made changes to support bumpMapped Tube

The engine now works with the bumpMapped Tube.
support rotations
merged master into branch
collidable changes
small debugging fixes
Bounds fixes
Merge pull request #14 from 5-second-rule/tube-collisions

Tube collisions merged