Merge pull request #58 from znagler/background

Background
add in boss rotation
remove rotation of alien boss
Merge pull request #59 from znagler/boss_shoots_at_player

Boss shoots at player
players bullets dont exist when out of bounds
boss doesn't shoot unless he's in bounds
refactor fire the bullets in fight.js
player only shoots once aliens have scattered
Merge pull request #60 from znagler/boss_shoots_at_player

Boss shoots at player
boss alien sprite inserted
Merge branch 'master' of https://github.com/znagler/flashforward into background
checking for upstream conflicts