Simplecov and Travis CI

Early xmas present - add this code to get coverage reports everytime you run rake- check your coverage folder. Also, I've included the config to setup your app on Travis CI. Travis CI monitors your app and builds it everytime you push (in this case to the dev branch), so that you get an email report if the test suite is failing. This will be useful to know about breakages as soon as they occur.

You'll need to visit Travis CI and log in via Github. It should then figure out that you have your repository linked and it uses the .travis.yml file for config. Have fun!