adds support for coveralls on the unit tests

adds coveralls support!  

Here's what the current report looks like when you aren't checking it out on the coveralls site (this can be pulled up locally):

![screen shot 2013-09-28 at 6 41 46 pm](https://f.cloud.github.com/assets/689411/1232319/9bfa1210-28a8-11e3-8554-ad2663930b58.png)