Bugfix/brian/pearson reg

Update content: FAQ, help page and front page video

Hotfix/alex/gst

pearson registration - removed telephone/fax placeholder attributes since they can't represent both domestic and international formatting easily

[#154]

pearson registration - revised rejection message text on dashboard, synced up email edx link text, revised contact styles/markup to remove giant red button dashboard for rejections

Added 2 new instructor tools

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

Another minor tweak to limit these tests to the cms.

pearson registration - resolved box-sizing display issue that caused form fields to not show text/be editable in Firefox/Mozilla

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