Add soundtrack and zombie spawn audio
Add hit and revival sounds
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
Merge pull request #31 from blzaugg/master

master
add lose game state
Merge pull request #32 from mjbradford89/master

add lose game state
Add zombie sprite