Shooting stays in direction player is oriented (direction player was traveling).
Small fixes
Merge pull request #13 from manimaul/continuous-fire

Continuous fire
Merge branch 'master' of github.com:manimaul/8bit-zombie-arcade into hud_and_interactions

Conflicts:
	8bit-zombie-arcade.xcodeproj/project.pbxproj
	8bit-zombie-arcade/Resources/bullet.sks
	8bit-zombie-arcade/ZAHeroSpriteNode.m
	8bit-zombie-arcade/ZAMyScene.m