Adding the date override page.
pep8 fixes.
A first commit at using get_term_by_date instead of current.

card dates still needs to be updated, but most of the code is live
Moving the card display dao to the current_quarter.  Adding more debugging info to the debug page.
Adding tests around the term dao, cleaning up the display dates admin page
Adding unit tests around card display dates.  Fixing a bug with card display dates found by that test.
Actually sets is_after_grade_submission_deadline, tests it.
Adding a test for the js overrides
Merge pull request #15 from uw-it-aca/feature/MUWM-2329

Feature/muwm 2329