Switch from wd to webdriver-sync

## NOT READY TO MERGE

Working with the author of webdriver-sync (@jsdevel) to make it a palatable
replacement. Posting as an illustration of how much less noisy this test
will look like when we're done.

TODO:

* Right now Phantom is not supported so we can't run this in travis
* Right now, the ChromeDriver bridge doesn't have a JS eval method.