Drop CSM FK on history

Discount holdback

Fix templates issues

PROD-465

Fix Template Issues

This patch is part of multiple PR's.

LEARNER-4632

Moved these packages to pypi

If already DEFAULT Number of emails are sent, then verify that user
is enrolled in at least one verified course run for which the course
has not ended else stop sending emails

LEARNER-7313

* reword INCR-483: Make compatible with Python 3.x without breaking Python 2.7 support

pick INCR-483: Re-run isort for lms/envs/test.py

INCR-483: change import order

INCR-483: PyLint fixes

* INCR-483: Fixes useless suppression

* INCR-483: Remove unused get_swagger_view

Python Requirements Update

INCR-467: Updates on Python 3.x

Don't pin Django to a patch version.

refactor the login user method

Update the version of matplotlib running in sandboxes.

Changelog can be found here: https://matplotlib.org/1.5.3/users/whats_new.html

This version fixes the odd setup.py in matplotlib that tries to install
numpy as a part of matplotlib setup.py execution.

Looking at the changelog I don't see any incompatibility issues just bug
fixes and feature additions.

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.

Update django version.

site config management cmd

remove discount banner display flag

INCR-465: Updates on Python 3.x and disable: import-error

Python Requirements Update

Flag added to load limited courses on Dashboard