Merge hotfix-2015-06-16 back to master

Ensure that is_hidden does not affect equality checks.

SOL-795 Executive Summary Report

update the ICRV requirments status

After receiving the response from software secure update the ICRV
requirement status in CreditRequirementstatus table.

ECOM-1602

Add discussion API course endpoint

Increasing contrast in course nav accordions

Accessibility tweaks and patching RTL

Add a11y test for lms student dashboard

This endpoint returns course metadata relating to discussions as a
starting point for clients.

Allow course creation after deletion at same URL

MAYN-78 Extend Coupon/Discount Reports

remove in-memory files

Added columns to the CC purchases report. (added Qty and Total Discount. Moved the Total Amount to the last index).
Coupon code report.

Credit Eligibility Progress page display

1-Adding basic html for displaying eligibility table
2-Updated Eligibility Requirements Dynamically

ECOM-1523

no need to create zero by in memory images

added contents to test upload files

LMS: Modification in enrollment API

Added CourseEnrollmentAttribute model

ECOM-1719

Add comment endorsement to discussion API

certificates event tracking SOL-886

Create a common paginated list view

Fix bug in discussion API comment update

TNL-2384

Refactored Studio's PagingView to use RequireJS Text and moved it
to common so that it can also be used by LMS.

Deprecate course details API v0

This bug caused any attempt to update a comment with a non-null
parent_id to result in a 500 error without applying the update. The bug
was introduced in commit 2c7590d1.

A version of #8260 that is consistent on jenkins and locally

Fix dark lang and django.middleware.locale behaviors LOC-72 LOC-85

Reduce the number of queries when walking parents in MongoModuleStore by avoiding cache misses on the data due to missing runs