WIP WL-589 Upgrade to edx-django-sites-extensions 2.1.0

Update translations (autogenerated message)

Add a help link to the LMS header - and configuration to select Open edX or edX partner doc

Adds a context-sensitive link to learner documentation from the LMS. The base URL defaults to Open edX learner doc and can be overridden with the base URL for edx.org learner doc.  Also relabels the tab for support from help to support.

Updated User Info Cookie

Disable debug-toolbar ProfilingPanel

Updating this cookie here helps ensure the marketing site has the most up-to-date enrollment details.

ECOM-4895

- Cookie now includes users' enrollment info
- Removed user email address from cookie
- Refactored functions so that we can update this cookie on other pages
- Added six to ensure new code is compatible with Python 3.x

ECOM-4896

- Corrected import ordering
- Using a constant for the User password

ECOM-4896

There's a [bug](https://github.com/jazzband/django-debug-toolbar/issues/792)
that prevents wrapped views from working properly with the profiling panel.

Disable it by default.

dump item information to neo4j

Removing unused variable from recent word cloud updates

Revert pa11ycrawler back to 1.3.0

Merging rc/2016-08-31 into master

Update to latest `django-debug-toolbar`

Release Candidate rc/2016-08-30

DOC-2546: Remove refs to Hangouts; fix RTD URLs

AC-570 courseware search contrast enhancement

Current Grade Rest API implementation

pa11ycrawler 1.4.0

clear request cache to avoid memory leak

update to use https

delete courses in the same transaction as writing them

python3 compatibility

Also make sure we set the recommended settings according to
<https://django-debug-toolbar.readthedocs.io/en/stable/installation.html#explicit-setup>

Improve logging for email sending while registering.

Better instructions about who to ping for requirements changes

Deserialize BlockRecord.locator into a real BlockUsageLocator

Fixed Shift-Tab on menu and ARIA roles, groups

Fix discussion color contrast and remove gradients

TNL-5163

Fix spelling of permission.

Allow for site override of EDITABLE_SHORT_DESCRIPTION setting