added comment for preloading of roof image
moved image to data folder
change instance variable name
add Bullet class stub
add player class stub
implement Bullet.spawn()
add ArrayList to store invaders
implement Bullet.addInvader
implement checkCollide
implement collidesWith
added javadoc comments to Bullet class
Merge branch 'feature/bullet' into develop
Implement constructor, render, update, kill, addToScore
Remove createPlayer and drawPlayer
Change game over text color to orange
remove unused variable
add player class to main logic
remove trailing whitespace
add shoot method to player class
Merge branch 'feature/player' of github.com:natemara/space-invaders-processing into feature/player