Quick fixes to self assessment tests

fix tests--nosetests is overly excited about my code

Sort courses by announcement date

fix bug in instructor dashboard groups code

If there is no announcement date (in the policy metadata) then use a
heuristic to sort them.

If there is an announcement date, the use it in the heuristic to
determine if the course is new or not.

Fix/vik/remove mitxmako

Add MySQL-Python back in for AWS.

While this is a pain for content developer local environment updates it breaks the LMS in EC2 which is vastly more important.  We'll jsut have to address helping individual content people with installing MySQL if needed. This is a real dependency in production and I think those belong in here.

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.