JIRA:PROD-553

PROD-533

JIRA:EDUCATOR-4537

* 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.

Fix for test that broke related to DRF;

JIRA:EDUCATOR-4541

* 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.

EDUCATOR-4554
This fixes a bug where extended due dates were visible in the outline but not reflected on the courseware pages, resulting in problems not being submittable past the due date.
In order for edx-when to work on courseware pages, it has to be more careful about field inheritance, which version 0.2 achieves.

Update the version.

Getting 500 error on stage after upgrading to latest version
of newrelice.

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

added the updated dependency for oauth2

added the commit hash instead of branch

minor fix

changes made by make upgrade

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.

This reverts commit 5e8f90ca.

Upgrade the django-wiki version.

Both python 3 related but different reasons. numpy dropped python 3
support and faulthandler was pulled into python in python 3.3

Upgrade the django-wiki version.

Push notifications was only ever setup to connect to Parse.com a service
that has been discontinued.  Since we haven't replaced the functionality
for a few years now, remove this dead code.

In cms/templates/js/course_info_update.underscore we're allowing content
to not be escaped because this is by design according to the tests.
Long term there should be a better fix for this but for now this is
intended behavior.