check gemfile changes for sourced gems correctly
check gemfile changes for sourced gems correctly

fixes #3520

mdorrance/bundler,lmtim/bundler,davydovanton/bundler,nju520/bundler,mattbrictson/bundler-1,carpodaster/bundler,ligi/bundler,philnash/bundler,ngpestelos/bundler,wenderjean/bundler,ligi/bundler,cstrahan/bundler,asymmetric/bundler,wenderjean/bundler,simplybusiness/bundler,lmtim/bundler,EthanK28/bundler,RochesterinNYC/bundler,dilumnavanjana/bundler,roseweixel/bundler,neslom/bundler,Teino1978-Corp/Teino1978-Corp-bundler,seanlinsley/bundler,Teino1978-Corp/Teino1978-Corp-bundler,ximus/bundler,jingweno/bundler,joshsoftware/bundler,asutoshpalai/bundler,christer155/bundler,ipmobiletech/bundler,robinboening/bundler,CorainChicago/bundler,cdwort/bundler,suhastech/bundler,neslom/bundler,asymmetric/bundler,PG-kura/bundler,steved/bundler,tgxworld/bundler,ximus/bundler,elovelan/bundler,masarakki/bundler,AiyionPrime/bundler,nju520/bundler,carpodaster/bundler,ngpestelos/bundler,mattbrictson/bundler-1,agis-/bundler,mpapis/bundler,EasonYi/bundler,kohgpat/bundler,Elffers/bundler,danimashu/bundler,RochesterinNYC/bundler,christer155/bundler,h4ck3rm1k3/bundler,cstrahan/bundler,patvice/bundler,kohgpat/bundler,joshsoftware/bundler,suhastech/bundler,schaary/bundler,bronzdoc/bundler,Eric-Guo/bundler,mpapis/bundler,ipmobiletech/bundler,EthanK28/bundler,chef/bundler,Elffers/bundler,EasonYi/bundler,AiyionPrime/bundler,gregkare/bundler,pivotal-cf-experimental/bundler,elovelan/bundler,gregkare/bundler,anil826/bundler,byroot/bundler,danimashu/bundler,cdwort/bundler,frsyuki/bundler,frsyuki/bundler,philnash/bundler,steved/bundler,simplybusiness/bundler,schaary/bundler,chef/bundler,bundler/bundler,jasonkarns/bundler,zhangkuaiji/bundler,mvz/bundler,byroot/bundler,Wirachmat/bundler,pivotal-cf-experimental/bundler,h4ck3rm1k3/bundler,PG-kura/bundler,bundler/bundler,jingweno/bundler,tgxworld/bundler,asutoshpalai/bundler,agis-/bundler,Wirachmat/bundler,jasonkarns/bundler,seanlinsley/bundler,mvz/bundler,CorainChicago/bundler,dilumnavanjana/bundler,chulkilee/bundler,chulkilee/bundler,masarakki/bundler,robinboening/bundler,roseweixel/bundler,patvice/bundler,Eric-Guo/bundler,bronzdoc/bundler,anil826/bundler,mdorrance/bundler,zhangkuaiji/bundler,davydovanton/bundler