More game logic

Planes can move, so can the bullets. Update method for the bullets,
it’s removing all the bullets that have hit a plane or have left the
game field
More game logic

Planes can move, so can the bullets. Update method for the bullets,
it’s removing all the bullets that have hit a plane or have left the
game field
Merge remote-tracking branch 'origin/master'

Conflicts:
	game-object.js
TEst