Add example usage of Crowdhoster API usage

This adds some simple example requests for using the Crowdhoster API to return campaign data and payments.

![screen shot 2014-01-10 at 2 19 53 pm](https://f.cloud.github.com/assets/1132438/1891877/5b030fc0-7a45-11e3-9aae-e174ca7dba9e.png)