CAS Draft Mode

Make updating children and data of a draft make the correct checks for whether the document is already a draft or not

Add Draft module store that is used whenever any item is update in the CAS (but not during import, and not for templates)

waiting class added

adhere to the naming conventions of user groups (instructor_* and staff_...

respond to Cale pull request comments. Update access.py (LMS) to use the same 'check for legacy group name first' logic. Add SECRET_KEY setting to the CAS project so that auth tokens from CAS are accepted in the LMS

adhere to the naming conventions of user groups (instructor_* and staff_* of the LMS AuthZ implementation). While we're keeping our authz.py implementation - which is duplicative of LMS's access.py - in order to minimize code churn/risk-of-regression, there is data compatibility so the two systems will interpret the data the same way

added toast notification styles and basic js implementation

cross-browser css3