Merge pull request #1 from nancywong/nancy

Nancy
Merge pull request #2 from nancywong/nancy

merged and fixed, removed gameobject.h references
keep track of where bugs are and able to move bugs
2d array holds whether there is a tower, projectile or nothing
towers can attack, new projectile class, killing/hitting enemy still has some troubles
setting up for animations
bugs are killed correctly and projectiles removes correctly
removing and moving projectiles actually works now
added health and money, print stats
towers attack in different directions. Simplify buying a tower
merged
merged