Release to Master (2016-06-16 hotfix)

This commit "undoes"a previous hotfix, and allows a cms course_publish
signal to trigger a block_structure update_course_in_cache task, which
is run on an lms worker queue.

Changes:
    -exposes ALTERNATE_QUEUE_ENVS
    -adds routing layer in celery.py
    -moves prior dev_with_worker settings file to devstack_with_worker
    -moves course_block api functionality into openedx/core/djangoapps/content/block_structure

Create forums config model for adjusting connection timeouts.

Remove invalid css syntax.

Update translations (autogenerated message)

Remove improper scss syntax.

Merging Patch Release 2016-06-15 back to master

This line can safely be removed since it does not impact
styling (nothing is being supplied to calculate).

Reference [here](http://www.w3schools.com/cssref/func_calc.asp)

This was a typo that was missed, and is not resulting in any styling.

Removing it is a no-op.

The original committer does not work in this code anymore, and
it is old enough such that changing it would be more disruptive.

A more considerate outer_atomic.

A named outer is suitable when dealing with IntegrityErrors. It only
checks that it is not nested under an atomic only if it is nested
under enable_outer_atomic(name=<name>). This way only the view which
is causing IntegrityErrors needs to have its automatic transaction
management disabled and other callers are not effected.

Changed refund log level to warning.

ECOM-2378

AC-455 adding main to PDF books; styling chapters

Patch Release 2016-06-15

Merge Release to Master

Don't try and cleanup a directory that doesn't exist (in badging tests)

Release Candidate rc/2016-06-14

Can't report or vote for your own posts

Added support for OpenID Connect single logout

In addition to logging the user out of LMS, the logout view also logs users out of the IDAs to which they previously authenticated.

ECOM-4610

Revert "Revert Adding logic to check if cert is invalidate then user cannot see the cert"

HULL-22 Get platform name via microsite configuration for forgot password page

ECOM-4217

Test marked as flaky

[PERF-325] Add versioned course asset URLs when canonicalizing asset paths.

Fix remove user from cert-exception list

Merge pull request #12714 from edx/tasawer/bugfix/ecom-1730-fix-integrity-error-in-student-enrollment

Fixed IntegrityError when making parallel enrollment requests for the same user / course

ECOM-1730