Removes redundant KeyboardStates in Player.cs. Comments confusing pos.
Adds rock collisions.
Rock collisions occur. The rocks hitboxes are not checked properly yet.
Found the missing / 2. Velocities are now added instead of being assigned in the PlayerRockCollision.
Merged 'rockThrow' branch in so that rocks collide-detect pink.

Conflicts:
	Cliffhanger/Cliffhanger/LevelOne.cs
Rocks properly dispose of themselves after 5 seconds.