Update to the latest version of celery, and django-celery.

Ensure cohort management section has loaded.

Move location identifying strings into index (SOL-833)

Update in-course reverification XBlock SHA in requirements.

Update django-debug-toolbar-mongo to work with DJDT 1.x

TNL-2120, TE-849

The parent .cohort-management class was loading faster than its children (which makes sense). However,
flakiness existed on these tests because browser actions were depending on child elements that had not
painted yet.

Tested this using chrome with no X11 forwarding for extra speed. That exposed the ajax call
as well as the sub-class rendering issues.

When celery runs in eager mode, there is a bug and an exception
is not thrown when using retry logic. A PR to fix the bug can
be found here: https://github.com/celery/celery/pull/2607

In the mean time, we have to deal with the fact that in eager mode
celery will not throw the exception but simply return it. So we
raise it ourselves.

skip test that are causing incorrect pep8 reports in jenkins builds

Changelog for 3.1 can be found here:
  http://celery.readthedocs.org/en/latest/whatsnew-3.1.html

Changelog from 3.1.0 to 3.1.18 can be found here:
  http://celery.readthedocs.org/en/latest/changelog.html

Delete static_tab for split courses raises 500 error

Updated ora release tag.

ECOM-1476: sending email on software secure response initial work

Exclude filtering for microsite orgs

Updated Take Photo page to include verification requirements

The version of django-debug-toolbar-mongo we have installed does
not support our version of Django Debug Toolbar. The author did
accept a patch that supports the latest version, but has not
published it to PyPI. This just grabs it from the github commit
instead.

Note: This will not uninstall your old version. If the MongoDB info
is not showing up for you in DJDT, try manually uninstalling with:

  pip uninstall django-debug-toolbar-mongo

Running "paver lms" after that should install the right thing.

As part of the unification of verify later/now, the take photo page needs to list the verification requirements.

XCOM-254

Add params to CS query in thread list endpoint

The thread list endpoint needs to restrict the set of threads it
retrieves if the course is cohorted and the user is not privileged.
This also adds an explicit default sort (by most recent activity).

(SOL-776)(SOL-740)(SOL-532) Prerequisites for course discovery feature

add lettuce features to the omitted directories in coveragerc files

Clean up keyword_substitution.py

Make user_track use eventtracking

add custom PayPal payment button and js tests for buttons.

Hiding Billing Address for Orders without Billing Addresses