Show the username in the top right

![2013-02-07 11 20 44 pm](https://f.cloud.github.com/assets/86435/138440/f2f59f8a-71a6-11e2-8838-ecebe7750bea.png)

Step 1 towards user settings.
Also makes user login a little smoother visually
May break some rare redirects (don't think so), but those aren't in effect with the current master branch.