Avatars, Dummies, and Schema

Added basic avatar support. As of now users can't change their avatars,
but will be in the future (including, possibly, remote resources).
Avatars work in the Portal.

Added a dummyClient.js file, which is a simple TCP script that connects
to Nova, logs in as anon, and enters NovaNet. Useful for debugging.

Also added create code for the users and friends table. They were never
formally placed within the .git, so I'm doing so now.