Merge Release to Master

Release Candidate rc/2016-10-18

Fix Moldova spelling on dropdown list

Removed unnecessary http:

Fix flaky test: test_youtube_id_w_different_local_server_sub

Fix screen-reader capa status prefixing

Remove invalid selector

[TNL-5632] Don't request responses/comments for non-AJAX requests.

Firstly, we're now explicitly instructing the comments service to not
return thread responses/comments if the request isn't AJAX.  So, if you
load the URL for a single discussion thread in your browser, this would
be a non-AJAX call and we'll avoid loading the responses for the entire
thread behind-the-scenes.  Big win here for large threads.

Next, we removed a redundant "get threads" call which was also happening
behind-the-scenes.  This call was redundant as the front-end JS also
grabs the thread list when a topic is chosen, so we were making an
extranenous call for no benefit.  Poof, gone!

Finally, we added some caching of database queries that are required to
drive a lot of the permissions/cohorts machinery around discussion.
This will have a minimal effect but introduced a cleaner way to apply
general memoization at the per-request level which will let us further
cache things as we identify them as issues.

TNL-5735

Convert capa/display.coffee to JS.

Refactored middleware that supports SESSION_COOKIE_DOMAIN overrides.

ENT-36: Fix NameError issue for saml mangemement command

TNL-5759

Update python-saml to latest version (v2.2.0)

Use MathJax -full config.

For more details, see the release document: https://github.com/onelogin/python-saml/releases/tag/v2.2.0

(cherry picked from commit bec0aeeb42d9b30580eed51efcde2b089e3693c5)

Ability to hide Pages from students

Added flaky tests.

Use Correct queue for grade recalculation

New tickets:

    TNL-5770
    TNL-5771
    TNL-5772
    TNL-5773
    TNL-5774
    TNL-5775

Fix for UTM parameter tracking when UTM not present

stop reporting to coveralls

aws.py redefines the default queues in order to expose cross-environment
work. The new recalculate grades routing key shgould use that value
rather than the default defined in common.py.

Set up DateUtil factory, modify requests to handle moment-timezones, moment-with-locales.

Forgot Password - Verbiage Update

update error messages in enrollment API

ECOM-4763

ECOM-5684

Move cors_crsf to openedx/core

Clean up student/urls.py