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?
This is minor, but I don't think we refer to verified as "ID Verified" anymore. For example, the verification flow has a status in the upper-right which used to read "ID Verified," but now reads "Verified."