Clytwynec/add paver test a11y

adds an accessible label to the search input and the search button

Updated Zendesk error handling

Fix date summary blocks for courses without an end date.

MA-1044 DiscussionTopic - Added bulk operations

Remove legacy MITX_FEATURES reference

Properly logging exceptions so we have the complete stacktrace.

ECOM-2792

SOL-1377: allow certifcate exception to be added for multiple courses

Added checkout error page.

Upgrade draggabilly.js to fix Firefox iframe bug

added unit test to test certs exception same user different courses scenario

Allow bok-choy default_store to be controlled by env vars.

TNL-3627

Refactor for multiprocessing.

I also took this opportunity to do some small cleanups of the date
summary code, specifically converting some attributes to properties in
order to remove a Pylint directive disabling warnings about missing
docstrings.

(WIP) Proctoring: fix sass and use updated edx-proctoring version

ECOM-2516

SOL-1346:convert string to bytestring before passing it to urllib.quote_plus

Fixes invalid/improper microdata and attribute values in the header logo

Fix stale RTD links in CONTRIBUTING.rst OPEN-1047

TNL-2646: Escape json in Studio

Course pacing template changes.

Make escaping for json simpler and more consistent in Mako templates
- add escape_json_dumps to escape and json.dumps
- add escape_js_str to escape javascript string
- refactor Studio to use escape_json_dumps in Mako templates

TNL-2646: Escape json.dumps

Removing this particular call to json.dumps was done by removing
the complete method subsection_handler which is no longer
used.  The template edit_subsection.html had already been removed.

TNL-2646 Escape json

Release 4 November 2015 to master

Fix underscore extraction error

Update `cert_info` docstring with correct return type.

Disabled auto enroll in ccx coach's enrollment tab

Fixing cert_status None bug

Fix `withData` and `withConfiguration` helpers.

Where possible, use ugettext_noop instead of lambdas assigned to the underscore