Fixed broken test suite

@mimming - Due to the recent POODLE security vulnerability, Firebase dropped support for SSL v3. Unfortunately, PhantomJS uses SSLv3 so this test suite was broken. Thankfully, Travis supports running the test suite in Firefox. Locally, the tests will be run in Chrome.
It's just a Firebase that Rob owns that we use in a lot of test suites. It's set to read true/write true and has no important data in it. I switched it from a demo Firebase because the Firebase client was having issues connecting to the demo Firebase for some reason. I'm going to work with Rob today to figure out why that was the case with firebaseio-demo.