Update xblock-mentoring.

Update reference to the xblock-mentoring repository.

A bug where answers containing the string "??" would get mangled by jQuery has been fixed in xblock-mentoring.
Remove duplicated data from legacy events

When event-tracking was fully integrated into the platform, some data was replicated in the context in the middleware and then later extracted and moved the old location by event-tracking. The legacy code path was not updated to remove this transient shim data from the context resulting in duplication of the information. This patch ensures that the transient information is removed from the context before emitting the event.

Fixes: AN-2369
Allow external_auth registrations to bypass PW complexity check
Disable css3 animations in bok-choy tests.
Annotation Tool: Bug Fix Filtered Personal Annotations on Page Load

- Made sure that all highlights were removed.

- Forgot closing parens

- added comments to fix
Annotation Tools: Spacing Issues fixed for catch.js
update bok choy db caches
Disable video handout tests
Merge pull request #4351 from lduarte1991/lduarte-harvardx-pr8

Annotation Tool: Bug Fix Filtered Personal Annotations on Page Load
Merge pull request #4629 from edx/anton/disable-css-animations-in-bok-choy

Disable css3 animations in bok-choy tests.
Merge pull request #4643 from edx/zoldak/disable-video-handout-tests

Disable video handout tests
Annotator Tools: Fixing annotator break in login and dashboard
Advertise JIRA
Show the enrollment counts for each mode on the instructor dashboard.
Merge pull request #4615 from edx/dcs/enrollment_count_dashboard

Show the enrollment counts for each mode on the instructor dashboard.
Reorganize README
Check if user is anonymous before calling PSYCHOMETRICS
LTI grade callbacks for example, come in with an anonymous user.  This causes a
stack trace in the psychometrics app that leads to the LTI service
getting a 404.  This adds a check before that callback gets registered.
Merge pull request #4648 from edx/db/advertise-public-jira

Advertise JIRA
Remove setuptools

Oops
Merge pull request #4650 from edx/db/remove-setuptools

Remove setuptools