Hide show_timezone from Advanced Settings and migrate courses with show_timezone=False to using due_date_display_format.

STUD-724

Test course for allowing custom formatting of due date strings.

STUD-724

Try making the name of the course match the folder name.

More cleanup.

More cleanup.

updates.

fix templates

Also added datadog application to commom django apps and set it to use
a local statsd server by default.

Necessary for RFC compliance with oauthlib

The home icon and discussion topic drop-down icon now have text that is
visible only to screen readers. The visual change between the icon and the
topic name with down-arrow is now achieved with the CSS visible property
instead of the opacity property, so only one at a time will be visible to
screen readers as well as visually.

LTI blade allows to include LTI components to courses.
Python integration, Jasmine and acceptance tests are included.

This reverts commit 2894b21c, reversing
changes made to 34d0fe15.

Add simplifyed template.
Update lti integration test.
Add getting oauth credentials from course settings.
Add user id transferring to provider.
Improve documentation of lti module.