Added first boss zombie type, the Aberration (name subject to change to fit the comedic naming scheme). The Aberration is a disgusting green, shapeless horror with tentacles all over its body and an opening on its head lined with razor sharp teeth. The Aberration has an incredibly large amount of health and will spit acid (for now) at the player in buckshots, like the Boomstick. However, the rewards for killing such a beast warrant much experience and cash. Are you up to the challenge? The Aberration will appear every 25 waves (wave 25, 50, 75, etc...  subject to change). A temporary key has been assigned that will set the current wave to 25 for those of you who want to see it in action. The key to set the wave to 25 is J.

Also corrected issue where extra experience would not carry over to the next level when the player levels up.