Various changes.

Added bow an arrow items, added support for item stacks, added a folder
in images for entities, made the player walk slower when using items
(more slow the faster it's used), made skeletons face a direction and a
few minor edits.
Image update.

Removed whitespace on bow/arrow item placeholder images and made a
proper placeholder for the arrow entity images.
move ie disabling to GwtDefinition
Merge remote-tracking branch 'upstream/master'

Conflicts:
	RTRL-android/assets/images/player.png
	Roguelike/images/entity/player.png
	Roguelike/images/player.png
	Roguelike/src/org/tilegames/hexicube/topdownproto/entity/EntitySkeleton.java