added Vec3.prototype.scale, will probably replace .mult in the future
added Vec3.prototype.scale, will probably replace .mult in the future

schteppe/cannon.js,schteppe/cannon.js,Tezirg/cannon.js,jzitelli/cannon.js,beni55/cannon.js,Tezirg/cannon.js,mcanthony/cannon.js,jzitelli/cannon.js,beni55/cannon.js,mcanthony/cannon.js