Knock out's and vending machines

Vending Machines! Yes! Instead of focusing on stuff that's important, I drew and imported a vending machine that doesnt actually do anything! I'll add actual functionality later. Maybe.

Added a health bar, game over screen, knockback, which was the toughest one of all of the above. The slime enemy is finished, but this will get polish later, along with everything else. 

Screenshot Time: