Microsoft social login is not working on edx mobile app. The issue
is fixed in newer version of social-auth-app-django.

PROD-718

- edx-sga recently released new release that supports python 3.5

Also update node-sass to a compatible version.
Include a regenerated package-lock.

changes made to fix jenkins/quality errors

changes made as suggested

added the docstring to fix quality issue

made a few changes to fix some tests

replaced json.loads with a util to handle bytes

changes made to fix jenkins/quality errors

changes made as suggested

added the docstring to fix quality issue

made a few changes to fix some tests

made changes as suggested

made changes as suggested

updated the requirements with make upgrade

Python3 RNG produces different results as compared to python2
In capa problems we save seed value and generate random state
using the seed. Python3 random generates a different state as
compared to python2. Thats why using random2 library to make
state genration consistent in both python versions.

DEPR-40

* Update Financial Assistance logic

Use the zendesk proxy app instead of the unsupported zendesk library.

* Move to pre-fetching the group IDs.

Rather than making extra requests to zendesk to list all groups and find
a specific group ID. Just make a pre-filled list of group IDs for the
groups we care about.  When a group name is passed in, it is checked
against this list and the ticket is created in the correct group so the
right people can respond to it.

* Convert to using ExitStack instead of nested.

nested is not available in Python3.

* Use ExitStack from contextlib2.

ExitStack has not been backported to the Python 2.7 standard library and
contextlib.nested is no longer available in Python 3.5.  We need to be
able to use something in both 2 and 3 as we transition so we'll pull in
contextlib2 which has backports of the full python3 contextlib.

-Removed Submit-feedback View
-Removed related tests
-Removed help_modal.html
-Removed help_modal.html test
-Removed zendesk from requirements
-Updated requirements

The old Notes Django app is the only caller of this no longer
supported library. I have verified that this old app is no
longer functional and is already slated to be removed as part
of DEPR-18.

So this commit simply removes the call to firebase-token-generator
and leaves removal of the Notes app to DEPR-18.

JIRA:EDUCATOR-4435

JIRA:EDUCATOR-4367

Pin to the minor version so that we can get patches via the update
automation.  Since Django is pretty good at SemVer we can rely on these
to be pretty safe and it will speed up our security update process when
Django releases new security patches.

* Install drf-yasg

* Add drf-yasg settings and urls

* Pin drf to make drf-yasg work

* Adjust config-models version to be compatible

* Remove django-rest-swagger (the old way)

This reverts commit 375ccb7b.

This reverts commit bf88bca7.

* Install drf-yasg

* Add drf-yasg settings and urls

* Pin drf to make drf-yasg work

* Adjust config-models version to be compatible

* Remove django-rest-swagger (the old way)

Changelog: http://docs.gunicorn.org/en/stable/2016-news.html

This adds a new django app -- edx-when -- that will copy start and due dates to mysql and allow per-learner overrides in the instructor dashboard, using the existing IDDE interface.
It adds a data migration for existing IDDE data.

The pinned version is the one tagged with a release that is also on
PyPI.

https://github.com/jazzband/django-pipeline/tree/1.5.3

Use PyPI instead since that will be faster.

This has the effect of preventing Open edX installations from having
details which should be in configuration (because they're
edx.org-specific) end up in their applications.

We intend for subsequent versions to be reviewed manually before
finding their way into edx-platform proper; this prevents subsequent
releases from finding their way in without human intervention