Fix EC2 tests

Apologies, I've managed to break the tests on #88 - I wasn't expecting such a quick response! :wink:

I'm not sure if the [commit status api](https://github.com/blog/1227-commit-status-api) is hooked up to travis to show build statuses on pull requests? If not would it be possible to switch it on, with the post receive hook notification to travis?