CLOSED - task 39: Attendance Reports 
https://github.com/maine207/aspen/issues/issues/issue/39
Report now supports a single school selected or no school selected. In
the latter case, the report will look for student period attendance
records for all schools with active schedules.
Merge pull request #53 from maine207/mco/attendance-reports-for-staff

CLOSED - task 39: Attendance Reports