Refactored bok-choy directory structure
Added fixtures for course and xblock creation
Added bok-choy Studio tests
Added bok-choy tests for ora self- and ai- assessment
Refactored auto-auth; added staff and course-enrollment options
Removed extra javascript properties from page objects
Merge pull request #2128 from edx/will/bok-choy-fixtures-rebase

Bok-choy fixtures, Studio tests, and (some) ORA tests