Department Checklist

http://courtwright.org/stops/ has the rough idea of what I was going for, and this actually implements a real version.  Here's a screenshot of the top of the actual page: http://imgur.com/7P9d3QR

This is basically just a version of the volunteer checklist but for department heads.  It's a rough first draft, but it standardizes a lot of the automated emails we were already sending out to department heads in the past, such as the emails asking them to review hotel rooms for their department.

The main thing this gives us is that when we don't hear from a department head, we can tell the difference between "they looked at this and didn't need to do anything" and "they didn't even look at this".  By making them click a button on the page, we can see who has and hasn't reviewed everything.

I'll leave comments explaining what I did in various files, code-wise.
Semi-related to this effort: in the past the room nights were hard-coded.  So the code assumed that Wednesday was a setup day and Thursday was an event day.  That's not true for other events, and it's not even true for MAGFest this year, so now we have config options so we can use ``CORE_NIGHTS`` to determine if a given day is during the event or before/after for the purpose of hotel room nights.