Refactored expected indices after email w/ mongo
Key order has no bearing on key order in queries other than for
Key order should be by greatest to least cardinality
Added sparse and unique declarations.
Fix error when changing course details on split
Reword course rerun notification
Make Studio and LMS register pages use the same language
Updating the platform header styles to match new site styles.

Putting the new edx header behind a feature flag.
Merge pull request #4934 from edx/benmcmorran/course-settings-error

Fix error when changing course details on split
Merge pull request #4944 from edx/sarina/make-studio-reg-copy-match

Make Studio and LMS register pages use the same language
Merge pull request #4938 from edx/benmcmorran/reword-rerun-note

Reword course rerun notification
Unflag Group Configurations, Render only existing children in staff view of split_test.
Define SELENIUM_DRIVER_LOG_DIR in paver bok-choy command
Merge pull request #4949 from edx/zoldak/define-log-dir

Define SELENIUM_DRIVER_LOG_DIR in paver bok-choy command
Add bokchoy tests for course reruns
Merge pull request #4948 from edx/christina/last-group-config-pr

Unflag Group Configurations, Render only existing children in staff view...
Merge pull request #4936 from edx/benmcmorran/bokchoy-course-reruns

Add bokchoy tests for course reruns
Merge pull request #4879 from edx/sanchez/update-platform-header

Updating the platform header styles to match new site styles.
Merge pull request #4899 from edx/dhm/mongo_indices

Refactored expected indices after email w/ mongo
Split get_block uses the passed in id rather than constructed
on returned block so that branch/version awareness is inherited.
LMS-11263