Purged gross model methods (mostly related to grade calcs)
More method removal
Fixed some views now that were using removed model methods
Merge branch 'develop' of https://github.com/burke-software/django-sis into grade_report_redo

Conflicts:
	ecwsp/grades/tasks.py
Added migration file oops
All caches should work now - minimally tested
Fixed errors in grade cache calcs
Use raw sql for course grade calculation for speed
Merge branch 'master' of https://github.com/burke-software/django-sis into grade_report_redo
Merge branch 'develop' of https://github.com/burke-software/django-sis into grade_report_redo
Supports newer version of scaffold reports
Updated task name reference for grade cache
Merge branch 'develop' of https://github.com/burke-software/django-sis into grade_report_redo
Functional skeleton layout for scaffold report done
Added empty sample_db
Removed handout33
Added commonly selected wrong answer
Merge branch 'develop' of https://github.com/burke-software/django-sis into grade_report_redo

Conflicts:
	ecwsp/sis/models.py
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