Added Lightning Snail

Created .ai File for Lightning Snail and added Mockups to the mockup
folder.
-Travis
Added Ice Snail

Created .ai File for IceSnail and added Mockups to the mockup folder.
-Travis
Added Fire Snail

Created .ai File for FireSnail and added Mockups to the mockup folder.
-Travis
Added Power versions of the Snail

Currently there are idle and burping versions of the Normal, Fire, Ice,
and Lightning Snails.
-Travis
Added Powerup Snail Sprites to Zero

Not yet coded in, but available.
-Travis
Merge branch 'powerups-branch'

Conflicts:
	gamefiles/Content/Snail.library
	gamefiles/Content/__pycache__/py_character_movement.cpython-32.pyc
	gamefiles/Content/__pycache__/py_clockHunter.cpython-32.pyc
	gamefiles/Content/__pycache__/py_globalVariables.cpython-32.pyc
	gamefiles/Content/__pycache__/py_level_logic.cpython-32.pyc
	gamefiles/Content/__pycache__/py_pickupSettings.cpython-32.pyc
	gamefiles/Content/__pycache__/py_wall_sticky.cpython-32.pyc