Ray sprite update
Beam sprite
Gray background
Raw images update
Merge pull request #24 from blzaugg/master

master
zombie collision turns off when hit and goes off screen
Merge pull request #25 from mjbradford89/master

zombie collision turns off when hit and goes off screen
Center raygun shot, kill offscreen zombies
zombies live to nearest edge
Add sountrack mp3 file
Merge pull request #28 from ethanbustad/soundtrack

Add sountrack mp3 file
Merge pull request #27 from mjbradford89/master

zombies live to nearest edge
Display score on screen
Raw images update
Add soundtrack and zombie spawn audio
Add hit and revival sounds
Ray sprite sheet
Fix Zombies spawning off-screen
Merge pull request #29 from westonhancock/workingBranch

Add soundtrack and zombie spawn audio
Merge pull request #30 from ethanbustad/sounds2

Add hit and revival sounds