Grades cleanup

check for null doc

PLAT-1046 – update library content block's children on branches

Small changes to the grades djangoapp
    -sets up mock_get_score context handler
    -fixes an issue with not invalidating lazy scores property
    -code quality fixes
    -query count optimization in PersistentSubscetionGrade.create
    -adds atomic blocks to avoid IntegrityErrors corrupting an entire request

Hotfix for TNL-5365

Revert "Bump opaque-keys version to 0.3.2"

This reverts commit 5d150a39.

See ECOM-5345 for more details.

Ignore IntegrityErrors upon set_many update save().

Update django-oauth-toolkit admin

AC-552 word cloud accessibility updates

Fixed account settings tab-panels.

ECOM-4186

Upgrade django-wiki to 0.0.9.

Fix Discussion blackout date still has Add a Response text box

TNL-5111

The new version fixes a problem where wiki fails with a 500 error when
combined org/course name/course run fields are longer than 50
characters.

Fix problem input error when inline is true

Trigger subsection grade update on SCORE_CHANGED signal

Don't use optparse's bad translation strings in passthrough_opts

Merging release branch to master from 2016-08-23 deploy

Release Candidate rc/2016-08-23

Comment out flaky lettuce test. TNL-5315

pa11ycrawler 1.2.0

RC fixup for student notes button

Use Persistent Subsection Scores in Grading

(WIP) SOL-2017: Unused code removed.

Hooks the pre-existing grades code into our new PersistentSubsectionGrade data
model. Includes test updates, and some minor changes to the data model that
were discovered in testing.

Merge pull request #13244 from edx/tasawer/bugfix/ecom-5184-incorrect-attr-on-id-verification-button

Removed incorrect aria tag from ID photo submission button