do not display count span icon when there is no role request
Merge pull request #250 from wangqiang1208/bugfixing/role-request-icon

do not display count icon when there is no role request
Use eager loading in material seen count traking to imporve performence
Merge remote-tracking branch 'upstream/development' into features/material-eager-loading
Merge pull request #251 from wangqiang1208/features/material-eager-loading

Material eager loading
optimize seen_materials checking performance by pre save it to an array
eager load materials with files
futher refine code
Merge pull request #252 from wangqiang1208/features/material-eager-loading

further optimisations for materials
re-run test cases when student submit again
Merge pull request #253 from wangqiang1208/bugfixing/auto-grading-not-refreshed-after-unsubmit

re-run test cases when student submit again
move eval_answer to submission model
evaluate answer in mission_submission show action for staff
Whitelist uuid.
White list vars for M15, too.
Merge pull request #256 from DIdiHL/white_list_uuid

Whitelist uuid
Unblock the vars function in the whitelist
Merge pull request #257 from soedar/whitelist-1010s-oop

Unblock the vars function in the whitelist
Merge pull request #258 from wangqiang1208/features/run-test-cases-for-submission-show

show test cases results for submission show action
fix eval_answer refactor regression