DEPR-106: Remove from openedx because it's deprecated

python -m edx_repo_tools.modernize_openedx_yaml --path=openedx.yaml
The following packages were installed: git+https://github.com/edx/repo-tools.git@4ac2ffde02b6df4bf633f7b88966137d71233bb1.

[BD-6] Add support for Django 1.11.

Fix tests for Django 1.11.
Upgrade requirements.
Add constraint.

[BD-6] Compatibility with Python 2.7 and Python 3.5

Update code and tests to work in python 2.7 and python 3.5.
OEP-18 compliance.
Update travis configuration.
Upgrade requirements to be valid for python 2.7 and 3.5.
Fix next function.
Fix six reraise.
Update gitignore.

Add Dockerfile

Request package upgraded and oep-18 added

prod-293

Speed up Notifier run time OPS-4175

notifier routing key added to tasks

* Convert raise --> six.reraise()

https://six.readthedocs.io/index.html?highlight=reraise#six.raise_from

* Old style exceptions --> new style for Python 3

Old style exceptions are syntax errors in Python 3 but new style exceptions work as expected in both Python 2 and Python 3.

* Fix raise, xrange(), and raw string

* Travis CI: Add Python 3.7 to testing in allow_failures mode

Helps us understand were we are on Python 3 compatibility.

* Update .travis.yml

* Add Python 3.6 to the testing in allow_failures mode

* requirements.txt: MySQL-python for Py2 and mysqlclient for Py3

* wsgiref is now in the Python Standard Library

https://docs.python.org/2/library/wsgiref.html
https://docs.python.org/3/library/wsgiref.html

Drop support for datadog

DEPR-9

Only trigger travis push on master

Allow specification of max tasks per child via os env.

EDUCATOR-2359 | Add celery config to restart worker after 100 tasks.

This reverts commit d9362ee2.

This reverts commit 31c393b0.

WL-1403 | suppressing digest notification for WL-sites.

Add redis to requirements-OPS-2478

Really, really, really make sure we have a LANGUAGE_CODE.

Django==1.8.18, jam the language_code into settings.