Fixed Mob Drops, Add Rare and Uncommon Drops, Looting inflicts Drops

Fixing bug #36
Fixing wrong Mob Drops
Adding Rare Drops
Adding Uncommon Drops
Adding Looting inflicting Drops
Blaze now only drop Blaze rods if killed by a player
Spiders now only drop Spider eyes if killed by a player
Slimes now only drop items if size = 1
Magma Cubes now only drop items if size > 0