Increase sleep time in test_delete_group test, to try to help Travis.
Merge branch 'release-0.12.0' of github.com:learningequality/ka-lite into release-0.12.0
Styling tweaks to reduce interference from Bootstrap.
Show link to store beside points as needed.
Tweaks for top nav, fixing spacing and duplicate IDs.
Fix to only drop non-current-unit exercise points when ds says so.
Fix to store view logic; avoid errors when purchased item not available.
Embed store item images as data URIs.
Basic implementation of API endpoint closing after test end.
Fix UserTestObjectsAuthorization. Add test.
Adds test to check teachers can still access tests while disabled.
Adds wrapper for error handling to give cleaner error message.
Show A/B testing condition description welcome message on homepage.
Don't apply facility-dependent A/B-testing conditions for teachers.
Added confirmation box for unit switching.
Cleans up imports.
Merge pull request #2349 from jamalex/nalanda_rct3_finalization

Nalanda rct3 final tweaks
update student_testing_mixin to reflect fix for using the tests's total questions
update coachreport tests to reflect fixes on using a tests's total questions rather than the student's total attempts
display total_questions rather than total attempts in the coach report