Add docs for QA test suite

* documents location of QA test quite
* documents qatestbot and kicking off tests
Update to django 1.4.5.
[bug 839616] Remove A/B test for Refine and Focus

Revert "[bug 830753] Add Refine and Focus A/B test (Google Content Experiment)."

This reverts commit f3ca0444b802b53bc90134c46eb0fcc3e53de75c.