Fix: deleting JS test reports in Jenkins

Make the UrlResetMixin load the urlconf after resetting it, and fix the ...

This allows the build to pass in Jenkins

Catch InvalidLocationError

Make the UrlResetMixin load the urlconf after resetting it, and fix the comment client test that was leaving ENABLE_DISCUSSION_SERVICE at True

Make the problem handle empty fields and non-integers correctly.

Peter fogg/fix default videos

Fix Lyla showing up everywhere.

Use separate venv for parallel builds

Cosmetic Cleanups Incidental to Next Gen Modulestore Implementaton

Dcadams/email on invite

Optionally email students on enroll/un-enroll actions
by instructor from enrollment tab in LMS.

This ensures that `rake test` will clean the report directories
*before* running the JS tests.

Studio - revises transparent Sass color vars to use rgba() method

move marketing iframe breakout script to inside existing conditional

Previously XML data wasn't parsed in VideoDescriptor.__init__, leading
to the defaults being used for video settings.

Add handful of events to the Segment.io whitelist

Greater dir naming flexibility.

New course creator group.