shama/voxel-creature — pull request #1 by parris (2014-08-15 08:04:14+00:00)
Title: Add the ability the disable physics

Without this there is no way to turn gravity off for a creature.

`game.addItem` checks for opts.velocity truthiness. If it is true it does `item.subjectTo(this.gravity)`. We need to be able to leave velocity undefined so gravity stays off.