add management command to regrade partial-credit problems affected by ge...

hot fix for delete_item. The 'delete_all_versions' is useful in that it ...

Make sure that test-requirements.txt doesn't install versions of libraries that requirements.txt has pinned, and cache pip downloads

Make sure that test-requirements.txt doesn't install versions of libraries that requirements.txt has pinned, and cache pip downloads

hot fix for delete_item. The 'delete_all_versions' is useful in that it is set to true when doing explicit deletes as opposed to 'delete draft'. If delete_all_versions=False, then don't remove the deleted item from the parent children collection

Fix/vik/oe pep8

Add logging to debug strange cohort behavior on prod.

do a bunch of pylint improvements

Feature/jkarni/folditx

Strange behavior:
  - There are 20 cohorts that users should be randomly assigned
    into in HeroesX
  - Almost all, but not all (e.g. ~3300 / 3400) users end up in the
    same group.
  - testing manually locally and on prod in a django shell shows
    nothing wrong

Fix modulestore tests for pep8 violations

Feature/cdodge/pylint cleanup

  Less is more.

Initial implementation of htmlbook.

Make numeric response handle plus sign exponential correctly

delete_item should update the parent's list of children to reflect the d...

NumericResponse was failing to accept as correct an answer with a plus
sign in the exponential. For example: 5.0e+1 was marked as incorrect
if the answer was 50. However, 5.0e1 was marked as correct. This
caused confusion, since the answer shown to students included the plus
sign.

LMS Lighthouse [#242]