Show person memberships

Now all departments are listed at the top of a person's profile page.

![screen shot 2014-09-04 at 10 46 56 am](https://cloud.githubusercontent.com/assets/957859/4153776/0a06a5a6-345c-11e4-9da5-e25dbd1bc92a.png)

And all of their groups are listed a little further down in their own section, right below the about and degrees sections.

![screen shot 2014-09-04 at 10 47 02 am](https://cloud.githubusercontent.com/assets/957859/4153763/f5b45c9c-345b-11e4-9f40-a65cdc184072.png)