Moved Collision class to the engine and adjusted Entity so it can resolve contacts. Added radii vector3df to transform so the radius, original radius and the outerradius can be defined at X, Y, Z respectively.
Merge branch 'EnemyAI' of https://github.com/gametechnology/psi-2013 into EnemyAI
Fixed the 300 errors generated by the transition of the collision from the game to the engine. Collision class adjusted to only handle Entities, removing an in between step in the development.