WIP: student verification status

* Decide what to display next to courses on the dashboard, based on the course mode and verification status.
* For now, just dumps a debug message to the dashboard.  We still need to add the actual styles and messaging.

@stephensanchez @rlucioni thoughts?
No, we should test that too.  I need to check with Griff/Andy about what the expected behavior is for prof ed though.