Adam/merge release to rc

[TE-1511] Make --with-xunit(mp)? and --xunit(mp)?-file match in all test suites

Update translations (autogenerated message)

Fixed CCX coach dashboard access issues

Add OpenStack Swift support

Update the django-wiki version number.

Revert "Remove receipt page links' bottom borders"

This reverts commit 01e21049.

quiet some noisy logs

Added author

AC-520 fixes `section` ignores

Change IRC references to Slack

filter inactive user partitions in user partition transformer.

AC-518 updates `button-name` todo; needs TinyMCE work

Bump UI Toolkit version to 1.4.1

Required for the breadcrumbs work I will be doing later this week. Also should issues we are seeing with NPM this morning.

Program detail page touchups

[PERF-344] Add versioning of cached course assets to allow graceful cache invalidation

When releasing the versioned assets work, we stumbled on a problem with old pickled
versions of the StaticContent objects residing in cache, which triggered a bug in the
code. Not wanting to blow away all cached items, we ended up having to revert and add
in some backwards-compatible helper code to ease the transition.

With this, we'll now utilize the version argument that Django's caching interface
allows, in conjunction with a constant value that can be modified when breaking changes
are being made, to let us gracefully ignore older cached course assets.

Convert Dates for Time Zone

Converts the dates on the dashboard, sidebar navigation, and important course dates to user specified time zone.

Center cards and add padding around logos. ECOM-4871.

Fix issues with topic truncation.

Refactor all S3 code to use the django storage API and add swift
settings for openstack deployments

Release

Replacing relative imports by absolute imports for all files into com…