working state of multiple invaders
Merge branch 'master' into bug_fix
Merge pull request #15 from jeffkynaston/styling

Styling
adds multiple invaders
Merge branch 'master' into bug_fix
fixes bug where invaders reaching bottom didn't end the game
Merge pull request #16 from jeffkynaston/bug_fix

Bug fix
fix starting point of invaders
fix bug able to start game multiple times