edx/edx-ora2 — pull request #228 by stephensanchez (2014-03-28 18:45:36+00:00)
Title: Updating the Assessment Models

This change updates the Assessment models to add a new timestamp, drop the graded_count, and update the APIs to be capable of setting the new grading_completed_at timestamp appropriately.

@ormsbee @wedaly Thoughts?

Hope this does not have a significantly poor impact on perf.