fix submission list page published filter
fix stats for training
move as_lesson_plan_entry to assessment
fix accessing child attribute
random fixes
Merge pull request #66 from jsyeo/jsyeo-migration

Migrate Assessments
Merge branch 'dev/architecture_redesign' of github.com:Coursemology/coursemology.org into dev/architecture_redesign
fix migration script for answer grading
remove unused last_commented_at from question table