Show membership number on account page

Resolves #64 

![Screen Shot 2013-03-15 at 10 41 42](https://f.cloud.github.com/assets/3565/263126/f2a78e86-8d5c-11e2-8e45-53efdecdcd62.png)

This currently includes commits from feature-63-uri-updates. PR #66 should be merged before this one is reviewed.