Modification for Issue 500

For issue https://github.com/mozilla/marketplace-tests/issues/500
More details here:
https://code.google.com/p/selenium/issues/detail?id=3088
This is not ready for merge until we know what direction we want to take for our Marketplace mobile testing.
Needs more modifications.

I recommend changing these methods to setUp methods if in the end you still want to restart the server before each test.