Updated package versions; lerp syntax change in three.js; using local painterly-textures

I've been working on a bootstrap of this and voxel-client; here are some changes to voxel-server that should make it work with voxel-client. I've been working on my fork at https://github.com/chrisekelley/voxel-hello-client . Next i'll update my fork of voxel-client to the one you released last night and (hopefully) send a useful pull request.