Make code more robust to bad input (for case where DB was populated with string None)
Don't put all of xmodule_js as src (changes coverage metrics).
Use ddt for shib tests
Remove test cleanups

Since `ddt` should make them unnecessary
Fix cached definition change detection
LMS-11485
Remove extraneous dollar sign in template
Remove unused files, add missing spec file.
Merge pull request #4003 from edx/pmitros/fix-sequential-none

Fix case where DB gets populated with string None
Merge pull request #5464 from edx/christina/js-coverage

Don't put all of xmodule_js as src (changes coverage metrics).
Remove no longer used stage-edge.edx.org.
Merge pull request #5477 from edx/nimisha/update_release_script

Remove no longer used stage-edge.edx.org.
Merge pull request #5467 from mlkwaqas/waqas/forum-typo-thread-show

Additional dollar sign in template
Show date and time on Schedules and Details in UTC (TNL-85).
Merge pull request #5433 from edx/oleg/fix-utc-time-studio-details

Show date and time on Schedules and Details in UTC (TNL-85).
Fixed incorrect relative time value in time.js.
TNL-157
Merge pull request #5479 from edx/waheed/tnl157-fix-incorrect-relative-time

Fixed incorrect relative time value.
Merge pull request #5469 from edx/split/content_update

Fix cached definition change detection
Convert acceptance to opaque keys
Fix course export/updates and upload CMS acceptance tests.
Fix cms hardcoded keys