Create Metrics for Organization Impact

Re: Asana Task [Create SIProject Metrics from Soundbytes](https://app.asana.com/0/4193197027370/5853795799162)

In order to show metrics like this (+ better) in the future:
![codemontage](https://f.cloud.github.com/assets/226228/724264/23680526-e02f-11e2-8936-1d6d21e79336.jpg)

This pull request adds data like this, editable in admin interface:
![metrics code montage](https://f.cloud.github.com/assets/226228/724261/151456d2-e02f-11e2-89d4-c2175c642629.jpg)