聪哥的bug
[yanan] tmp hide view lesson details button
Merge remote-tracking branch 'upstream/master'
[yanan] fix the bug which will cause mixpanel data upload failed
Debug: The config of winston.
Merge branch 'master' of github.com:SunshineLibrary/mothership
[yanan] fix the bug that some teacher cannot see students' correct ratio
Merge remote-tracking branch 'upstream/master'
Debug: Change config of winston.
[yanan] tmp hide button
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' into course-builder