A bear! A bear!

Follows you around infuriatingly if you're near it.
Otherwise does nothing.
Merge branch 'master' of https://github.com/BinkyToo/CCDQuest
Flip bear sprite to avoid walking backwards.
Spawn bears on random grass, forests, rocks.
Fix bears being visible through trees and greyness.
Draw overlay on non-visible but explored areas.
Add the overlay image for non-visible tiles.
Actually add that file.
visibility tweaks
Merge branch 'FLHerne-master'

Conflicts:
	main.py
grouped image stuff