use requestAnimationFrame for game loop
use new inherited blowUp method for Missile
fix blow up at wormhole bug
add message system
remove click to shoot
Merge branch 'game' into dev
add nuke weapon
add inventory to ship
fix missing item bug
move player info into separate object
make InputHandler simpler; fix showMessage on pause; move respawn to Player
make InputHandler parse key names
fix whitespace
move graphical logic into new Canvas object
add drawItems to Game.Canvas
add Game.Arsenal to manage items
implement shooting objects from item queue
fix async module loading bug
Merge branch 'dev' into game
make missiles more useful