[Resolver] Remove usage of flat_map because of Ruby 1.8.7
[Resolver] Remove usage of flat_map because of Ruby 1.8.7

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