use singleton_class since we drop ruby < 1.9.3 support
use singleton_class since we drop ruby < 1.9.3 support

drapergem/draper,SpencerCDixon/draper,chuck-john/draper,drapergem/draper,jianyuan/draper,outstand/draper,SpencerCDixon/draper,krainboltgreene/draper,donaldpiret/draper,liwangbest/draper,chuck-john/draper,totzyuta/draper,sideci-sample/sideci-sample-draper,estum/draper,yui-knk/draper,yui-knk/draper,mallikarjunayaddala/draper,jianyuan/draper,turingschool/draper,outstand/draper,drapergem/draper,mallikarjunayaddala/draper,Bastes/draper,baberthal/draper,turingschool/draper,liwangbest/draper,Bastes/draper,baberthal/draper,estum/draper,totzyuta/draper