deleted context from models
Merge branch 'master' into game_controller

Conflicts:
	invader.js
added animationloop
Merge branch 'master' into game_controller
Merge pull request #7 from jeffkynaston/styling

Styling
fixed laser argument error
combined front and back end
Merge pull request #8 from jeffkynaston/game_controller

Game controller
fixed redraw bug
Merge pull request #9 from jeffkynaston/game_controller

fixed redraw bug
fixed start screen scroll problem
implement display game over
add functionality to end game