Currency conversion

Adds controls for showing financial metrics in EUR, GBP or USD. Rate is static, but is correct as of 9/4/14. We need to make this dynamic at some point, but that's low priority Resolves #119.

![screen shot 2014-04-09 at 22 03 14](https://cloud.githubusercontent.com/assets/3565/2661228/6d0c24e2-c02a-11e3-8a8d-d0a9b6ababeb.png)
![screen shot 2014-04-09 at 22 03 23](https://cloud.githubusercontent.com/assets/3565/2661229/6d150d1e-c02a-11e3-9705-22a810e41faf.png)