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

This reverts commit f6c215ae.

Pin social-auth to less than 3.0.0 and social-auth-core to less than 2.0.0 to allow them time to bake

Note: this version update is backward incompatible.

ARCH-255

Upgrade the django-ipware package from the old 1.1.0 version to the latest version that supports Python 3
(version 2.1.0 as of this commit)

This PR is intended to close INCR-7 issue ( see https://openedx.atlassian.net/browse/INCR-7 )

(version 1.3.4 as of this commit)

This commit is intended to close INCR-8 issue (see https://openedx.atlassian.net/browse/INCR-8 )

This upgrades DOT by reverting the revert.

This reverts commit 4d8b9c36

ARCH-180

This is to upgrade the ddt package from the old 0.8.0 version to the latest version that supports Python3
(version 1.2.0 as of this commit)

This commit is intended to close INCR-6 issue (see https://openedx.atlassian.net/browse/INCR-6 )

We added a migration to a ManyToMany key in both directions and that had
to be done with RunSQL which requires sqlparse
https://docs.djangoproject.com/en/1.11/ref/migration-operations/#runsql

ARCH-193

18.0 seems to be doing a different thing with REMOTE_ADDR.

Putting this back to the last working version in production.

There is a breaking change in gunicorn 19 which changes
the behavior of the `REMOTE_ADDR` request meta info. It
no longer correctly passes through the value of X-Forwarded-For
if that header is present.

This resulted in making anything that looked at this attribute
think that all requests were coming from 127.0.0.1

This broke the django-ratelimit-backend library which relies on
this feature to determine if a user has had too many login attempts.

Gunicorn Change Log: http://docs.gunicorn.org/en/stable/2015-news.html

There are issues in the newest version that we don't want to pick up yet.

We're quite far behind, let's start by just looking at the treadmill.