fix bug of 'pending activities do not update after submission'
fix no bonus bug after traning submisson
futher refine the bug fixing
add TODO to submission time
Merge pull request #163 from wangqiang1208/bugfixing/grading

fix no bonus bug after traning submisson
Merge pull request #162 from wangqiang1208/bugfixing/submissions

fix bug of 'pending activities do not update after submission'
fix for announcement show page for student
Merge branch 'development' of github.com:Coursemology/coursemology.org into development
Merge branch 'development' of github.com:Coursemology/coursemology.org into Deploy