Initial creation of class
More or less completed Criteria requirements to grab 504 students.
Nearly complete.  Testing
Tentatively complete.  Flagged students without alerts have alerts
created and alerts without flags are deleted.
Broke it.  Trying to make the query more efficient.
Tentatively fixed and complete, take 2.
Cleaned comments and slight refactoring.
Description fixed and input definition uploaded.
Removed extraneous ClassAttendanceHistoryData.java source.
Merge pull request #73 from maine207/hnathanson/set-student-alerts-504

Hnathanson/set student alerts 504