adds updateInvader function that checks if invader is killed
Merge pull request #6 from jeffkynaston/vlad_kris_kendall

adds updateInvader function that checks if invader is killed
setup background image and basic styling
created title page
animate title
added styles for when the game starts
music added
add game started view state
initialize view
pressing spacebar changes start screen to game play screen
Add ability to display You Win
fix syntax error