New Feature: Usernames

We're now using usernames as well as e-mail addresses. I know there is no privacy policy for the site yet, but so you know we'll never use or display your e-mail address. That means that in the future when the forums are up and running you're gonna need a username to uniquely identify yourself.

This doesn't actually show up anywhere on the site yet, but I wanted to get it out of the way so that it didn't incovience too many people when it had to be added later.