Refactor staff grading to be easier to follow
Finalize refactor with staff_course
Add docs, fix error message
Fix tests
Final test fix
Centralize capsules (for peer refactor)
Add tests for staff grading refactor
Randomly shuffle calibration essays to avoid everyone seeing the same sequence
Properly define and use capsules
Capsules are no longer properties
Add in tests, clean up property to function conversion
Fix test
Merge pull request #126 from edx/vik/staff-refactor

Vik/staff refactor