edx/edx-ora2 — pull request #513 by wedaly (2014-07-17 21:09:02+00:00)
Title: More selenium

* Peer assessment acceptance test
* Student training acceptance test
* Retry with exponential backoff
* Move bok-choy into its own requirements file.
* Save screenshots on failure.

Includes the changes from #512

@muhammad-ammar please review