add some clarity to `lib/draper.rb` regarding which requires are for supporting test libs
add some clarity to `lib/draper.rb` regarding which requires are for supporting test libs

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