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
Merge branch 'development' of github.com:Coursemology/coursemology.org into Deploy