Fixed dummyattackhandler class crashing the game when you punch a zombie.
Added a check for whether the current item is null (empty hand) before
checking the item id of the current item.
Merge branch 'crafting' of https://github.com/TosinAF/Educraft into crafting
Took out debug prints from number zombie class
Merge branch 'crafting' into intro-level
Removed DummyMod class from game
Extended main room