Melee now does damage to enemies
playing around with dot products for the attacks to only hit the guys the player is facing.
player now "looks" at mouse cursor and attacks towards it.  WSAD activates walking.
Still need to work out dot products/angles for melee attacks
code cleanup
attacks now should all work.   Just need to tweak melee arc numbers.
Merge pull request #21 from FourierTransformer/ben/damage-system

Ben/damage system