Add recent Foursquare checkins

Fixes #8.

![screenshot](http://cl.ly/image/2h3v453n0r2Y/Screen%20Shot%202014-08-31%20at%207.51.33%20PM.png)

- Removes Shopify logo and replaces it with an Octocat
- Adds recent checkins from Swarm
- This isn't pretty at all, but we've got some more formatting that can land later