This reverts commit 5e8f90ca.

Upgrade the django-wiki version.

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.

* 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)

instead of localhost

* 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)

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.

Update deprecated pygeoip
to geoip2 and all usages
of it

Learner-6238

Update ORA2 repo version

Fix Python tests

Upgrade Recommender XBlock version

Remove unnecessary requirements and update bleacher usage

Keep html5lib unpinned

Upgrading requirements

Ignore python-interpolate-html for bleached html