clear upload_status if user makes changes to TestCenterUser or TestCenterRegistration (so the change is pending, rather than rejected)

Lets explicitly make the virtualenvs for now.

Add a try/catch so that Askbot removal doesn't die if there's no Askbot ...

Feature/brian/pearson reg

Feature/victor/beta testers

Update to the FAQ page

display client_candidate_id when registration accepted; strip whitespace from accommodation_request; cosmetic cleanup on pearson management commands.

Feature/vik/add staff grading notifications

Perform merge from master, including renumbering of migrations in common/djangoapps/student/migrations

pearson registration - restyled and tweaked markup for registration closed message and styled disabled labels appropriately

Feature/vik/add peer grading notifications

Temporary workaround to our bizarre jenkins/numpy issue.  

remaining:
 * support putting multiple names / emails in the big box we now have

* still needs to support uploading a list
* also want to clean up and refactor the code a bit

Remove circular dependencies that connect student.models and django_comm...

* add a days_early_for_beta inherited policy option
* students in the beta_testers_{COURSE} group get to see content that many days early
* Clean up some docstrings related to time formats
* Add basic test

Conflicts:
	common/djangoapps/student/models.py

added problem weight description