remove unused require
Fix content nil issue in gradings
Merge pull request #180 from wangqiang1208/bugfixing/course_96_grading

Fix content nil issue in gradings
Question number starts from 1 instead of 0.
Increase line limit, show cop names
Merge pull request #183 from jsyeo/jsyeo-line-cop

Increase line limit, show cop names
Merge pull request #182 from DIdiHL/fix_auto_graded_question_index

Question number starts from 1 instead of 0.
fix potential nil level
Merge branch 'development' of github.com:Coursemology/coursemology.org into development
Merge branch 'development' of github.com:Coursemology/coursemology.org into Deploy