Merge pull request #3 from HumberGer/master

Updating Cathoangludi~
Sound effects and BGM!
-Fixed bug where zombie could damage player during death animation
-Rebalanced player gun and zombie health
-Added sound effects for player shoot, turret shoot, and zombie death
-Added BGM for gameplay
-Set Portrait and Icon to be transparent
-Added zombie spawner: spawns zombies outside of screen in interval
-Zombies now have randomized speed.
-Removed extra zombie1 prefab
Merge pull request #6 from cathoangludi/master

Sound Effects + Magical Zombie Factory