FEATURE: Evaluation of supervisor performance

Students should be able to evaluate their supervisor. This could be integrated in to the Work College evaluation (Issue #8), or a separate evaluation (more similar to the student performance evaluation).

Based largely on LEE Committee work (contact @sheggen for details).

Rough notes:
- Allow student to view/review/complete evaluation from the student portal.
- Allow supervisor to view/review evaluation from supervisor portal.
- Allow labor administrators to modify the evaluation year-to-year.
- Allow departments to generate reports about departmental performance (or other similar reports; needs brainstorming).
- Allow labor administrators to review supervisor/department performance.