This PR also removes the exemption for staff from seeing the reset deadlines banner (staff will now see the banner). Staff users would still be unable to submit problems and wouldn't have a way of resetting their deadlines while enrolled.
Open EdX Features ----------------- This is the root package for Open edX features that extend the edX platform. The intention is that these features would ideally live in an external repository, but for now they live in edx-platform but are cleanly modularized.