//February 17, 2012
-Fixed Player/A.I collision(so player can take damage)
-Added in Velocity
-Zombies can no longer enter the player bounding box
-Zombies no longer walk over eachother (Needs Improving)
-Added Player pain sounds
-Moved all linked lists to a single class
-Added in shooting
//February 18, 2012
-Bullets now remove when hitting a zombie
-Bullets get removed when they reach the edge of the screen
-Added a controller for firing rate
-Zombies now dynamically spawn every 2 seconds
-Moving and looking around/shooting are independent.
-Added blood splats for when a Zombie dies
-Blood splat graphics are now randomized
-Blood now disapears after some time
-Added points
-Points are now displayed on the screen
-Coded in weapon system
-Added pistol to weapon system
-Added reloading
-Ammo is now displayed on the HUD
-Added manual reloading (Press R)
-Added SMG
-HUD now displays extra ammo
-Created 2 weapon system
-Added weapon switching