Fix issues with non-unique discussion targets

Merge release to master

added links to docs for listed libraries in overview.md

Flag test as flaky. SOL-449.

Bnotions/social features

Conflicts:
	requirements/edx/github.txt

update ora2 hash to address (TNL-1350)

When two or more instances of Discussion XBlock were configured
with the same discussion target (Category/Subcategory),
only one of the blocks would be shown on the Course Discussion page.
This was the source of several bugs when trying to edit discussion threads.

This patch adds incrementing numbers to the title of each duplicate
subcategory when rendering the Course Discussion to make sure that
all of the threads are visible in Course Discussion.

Allow the enrollment API to be accessed via API keys.

Merge Release back to Master

Event-testing pattern should be made available in a Mixin.

Rc/2015 02 26

add extra logging for postpay callbacks from cybersource (ECOM-1034) (EC...

Implement profile API

TNL-1491

See the API design here:

https://openedx.atlassian.net/wiki/display/TNL/User+API

XCOM-107

ECOM-1139: Example certificates.

Show the payment section if no contribution amount is selected

Add the ability to generate "example" certificates to
test that certificate generation is working correctly for a course.

Add the ability to enable/disable self-generated certificates
on a per-course basis.

Update translations (autogenerated message)

Make pep8 failure output easier to understand.

We are not using the limit flag in the actual run_pep8 method; removing
that from scripts. Operationally, pep8 has been enforcing a limit of
zero for awhile; this finishes that realization.

Also, all pep8 reports now appear under the reports/pep8 folder, rather than
per-system.

Revert "Refactor quality checks"

This reverts commit 19c767eb.

This reverts commit 747756a9.

<nav> for the footer and navigation does not include aria-label

Alison's Hackathon9 changes

PLAT-454: Fix import error when exported course edited.

Unicode handling for transcript filename

TNL-1253 https://openedx.atlassian.net/browse/TNL-1253