Merge pull request #32 from Daikatana/master

Added gun sprite
Merge pull request #19 from MikePaNtZ/development

Development
Character tweaks

Display enemy health, and fix their bounding box and their max health.
All characters get a move speed, but it needs some tweaks.
Enemy Shooting fixed

Moved enemy shooting logic into the state design pattern. Made all
shooting automatic, so we need a firing rate on guns. Small fix to all
character's center property, which fixed the enemy aiming.
Merge pull request #33 from Lakon/master

dev merge
Merge pull request #10 from MikePaNtZ/development

Development