gratipay/gratipay.com — pull request #2832 by whit537 (2014-10-21 15:13:41+00:00)
Title: add a retention chart

![screen shot 2014-10-21 at 11 12 45 am](https://cloud.githubusercontent.com/assets/134455/4720925/c74cf758-5934-11e4-9ef8-8f1779674eb5.png)