Change TOZ grader pilicy
unique_attempts in answer.rb is not working, fixed
Merge remote-tracking branch 'upstream/development' into bugfixing/auto-grade
Change mission submission method to POST.
Merge branch 'development' of https://github.com/Coursemology/coursemology.org into autograder_bug
Merge pull request #197 from DIdiHL/autograder_bug

Autograder bug
Using answer count to determine the first correct answer
Merge pull request #196 from wangqiang1208/bugfixing/auto-grade

Bug fixing for TOZ Grader
Using rake script to fix exsiting grading errors
Will not update when grade is not changed
Refine fixing
remove is_a check
Remove pref_grader check
Merge pull request #198 from wangqiang1208/bugfixing/auto-grade

Using rake script to fix exsiting grading errors
change exp bar style
refine coding style, add a space before '?'
Merge pull request #199 from wangqiang1208/features/exp-bar

change exp bar style