Add Selenium tests and Sauce Labs integration

Last build on my fork before switching the secure vars to be for the eregs group owned repository: https://travis-ci.org/theresaanna/regulations-site/jobs/14171626

It fails because it runs the Selenium tests twice - the first time along with Python unit tests before the API server starts, which Selenium needs. This is a non-issue as long as this is merged by CM after he does the appropriate nose configuration changes.

Also adds a definition in the dummy API.