OPEN - task 30: Student Assignment Score - New import 
https://github.com/maine207/aspen/issues/issues/issue/30

Preliminary complex error checking complete, but untested.  See comment
in issue.
Stuff has changed.  Probably broken - will fix eventually.
Almost complete -still some duplication issues with logging records.
OPEN - task 30: Student Assignment Score - New import 
https://github.com/maine207/aspen/issues/issues/issue/30
Renamed the 'Course' label to 'Section' to be more clear.
OPEN - task 30: Student Assignment Score - New import 
https://github.com/maine207/aspen/issues/issues/issue/30

Cleaned up comments to be more useful.  Maybe.