Updated packages; resolved some scope issues with game

Max - I've merged my changes with your latest version. I had some issues getting demo.js to work - I think problems instantiating some three.js objects involving player position. Instead, I'm bootstrapping it using https://github.com/chrisekelley/voxel-hello-client, which I link to in the readme. (In voxel-hello-client, I'm having to expose Buffer manually to make jsonparse happy, which seems rather peculiar...) Whatever the case, multiplayer is a go - I tested with three browser tabs playing and everything seemed to be updating fine.

Cheers - 

Chris