Fixed drop after block destruction

Woohoo, I be done!
otw - Added several new actions, will test soon.
Merge branch 'CollisionsPart2' of https://github.com/opencog/OpenCog-Unity3D-Game into ActionInterface
otw - Made some changes to the behaviour library and a few actions
otw - Basic Behaviours w/ actions.
otw - Updated a few classes, mostly minor changes.
otw - Added PostSharp to gitignore.