add course_ware
added download link generator
Add submitted_users
Add submitted_users, checked_users method
Add practice_record migration
Merge branch 'bgmaster' of github.com:mindpin/beikong-eshare into bgmaster
Remove default value of score in practice_records
set default value for score from practice_records
Fix practice model
Fix practice rspec
added doc convert support
Merge branch 'bgmaster' of https://github.com/mindpin/beikong-eshare into bgmaster
Remove unnecessary file
Fix practice_records fileds migration
抽取 practice_record 相关代码到 module
重构 practice_record
划分教师角色导航菜单
add doc convert
增加课件上传
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