TNL-5458
TNL-5493

Merging hotfix/2016-09-13 release into master

Fix the duplicate oauth_body_hash in the outcomes request

Wrap the discussion header in a <nav aria-label="Forums">

TNL-5193

TNL-5240: Cache comment thread.

AC-581 using UXPL values for course types on dashboard

Merge release into master

The "oauth_body_hash" appeared twice in the auth header in the request
when posting grade back to tool consumer. However, the signature sent
from edX is calculated based on only one oauth_body_hash.
On the tool consumer side, the signature is calculated based on the auth
header and will use the duplicated fields. So the signatures will not match.
And request will fail the signature validation.

The bug was introduced in this commit:
https://github.com/edx/edx-platform/commit/03cee389e0869263f5f9977098770495b5216733
on July 12th by updating the oauthlib.

Because 0.7.2(original version) doesn't have oauth_body_hash support, so a custom
OAuth1 client was implemented to add oauth_body_hash to the headers:
https://github.com/edx/edx-platform/blob/f5d0f3ff55d264ed4b68a24808b255aef5d8dad2/lms/djangoapps/lti_provider/outcomes.py#L24.
However, the new oauthlib 1.0.3 has support for oauth_body_hash
(https://github.com/idan/oauthlib/commit/51675237c410b413a11091926436420493c52866#diff-c2a1e5f1ddfe8e48ff62b59eb952644eR180).
So after updating library, oauth_body_hash is added twice.

This fixes the bug by removing the custom client and use the oauthlib
default client to generate the auth header.

Cache Enrollment state for (user, course) in request cache

patch/2016-09-12

Fix RTL issues with discussion sass

logging

Enable Persistent Grades in unit tests

TNL-4709

Fix extremely minor box corner issue in Discussions

Catalog-based MicroMasters need to be displayed in the LMS. However, the LMS currently retrieves all program data from the soon-to-be-retired programs service. Consuming program data exclusively from the catalog service is out of the question right now; it's too complex to confidently pull off in a week. This is a functional middle ground introduced by ECOM-5460. Cleaning up this debt is tracked by ECOM-4418.

Enable discussion forums on CCX courses.

Discussion is restricted to the CCX course (there is no sharing of
discussions with the parent course or other CCX instances).

Ensure usage keys have course run in locators.

TNL-5475

Optimize Subsection Grades update

TNL-5457: Performance enhancements for Discussions API.

- Default to with_responses=False, except when required.
- Clean up search call unused params.

Fix width of 'Load More' button in Discussions

Update xblock-poll dependency to v1.2.

Fix bug where new posts were not assigned a topic ID and would fail to post

Persistent Grade being saved for individual problems

* First take at forcing a subsection's grade to update when a signal is
  sent that a problem's score has changed
* Refactor signal handler connection.
* Expand bokchoy tests to cover progress page
* Add some grading unit tests

TNL-5394
TNL-5364