Resolver conflicts can happen in the Gemfile, so error appropriately
Resolver conflicts can happen in the Gemfile, so error appropriately

Fixes #227

Eric-Guo/bundler,ximus/bundler,tgxworld/bundler,RochesterinNYC/bundler,gregkare/bundler,carpodaster/bundler,CorainChicago/bundler,zhangkuaiji/bundler,rkh/bundler,philnash/bundler,wenderjean/bundler,chef/bundler,asutoshpalai/bundler,patvice/bundler,lmtim/bundler,Teino1978-Corp/Teino1978-Corp-bundler,AiyionPrime/bundler,schaary/bundler,AiyionPrime/bundler,zhangkuaiji/bundler,nju520/bundler,neslom/bundler,ducthanh/bundler,RochesterinNYC/bundler,bronzdoc/bundler,ligi/bundler,ipmobiletech/bundler,seanlinsley/bundler,mattbrictson/bundler-1,ligi/bundler,christer155/bundler,bundler/bundler,cstrahan/bundler,steved/bundler,elovelan/bundler,haonaturel/bundler,twcctz500000/bundler,sideci-sample/sideci-sample-bundler,gentoo/bundler,masarakki/bundler,simplybusiness/bundler,ipmobiletech/bundler,jasonkarns/bundler,roseweixel/bundler,asutoshpalai/bundler,pivotal-cf-experimental/bundler,kohgpat/bundler,neslom/bundler,smlance/bundler,nju520/bundler,haocafes/bundler,EasonYi/bundler,ngpestelos/bundler,seanlinsley/bundler,EasonYi/bundler,chulkilee/bundler,suhastech/bundler,tgxworld/bundler,philnash/bundler,agis-/bundler,PG-kura/bundler,dilumnavanjana/bundler,mdorrance/bundler,dilumnavanjana/bundler,trampoline/bundler,raphael/bundler,gregkare/bundler,danimashu/bundler,h4ck3rm1k3/bundler,mvz/bundler,cdwort/bundler,lgierth/bundler,wenderjean/bundler,anil826/bundler,Eric-Guo/bundler,davydovanton/bundler,danimashu/bundler,eagletmt/bundler,cdwort/bundler,byroot/bundler,kohgpat/bundler,smlance/bundler,mtscout6/bundler,h4ck3rm1k3/bundler,patvice/bundler,Flameeyes/bundler,jingweno/bundler,lmtim/bundler,cstrahan/bundler,pjump/bundler,robinboening/bundler,joshsoftware/bundler,Wirachmat/bundler,joshsoftware/bundler,ximus/bundler,Wirachmat/bundler,jaym/bundler,schaary/bundler,suhastech/bundler,TimMoore/bundler,masarakki/bundler,simplybusiness/bundler,frsyuki/bundler,robinboening/bundler,mpapis/bundler,christer155/bundler,pivotal-cf-experimental/bundler,r7kamura/bundler,mattbrictson/bundler-1,Teino1978-Corp/Teino1978-Corp-bundler,TimMoore/bundler,chef/bundler,sideci-sample/sideci-sample-bundler,vemmaverve/bundler,Elffers/bundler,anil826/bundler,chulkilee/bundler,e2/bundler,frsyuki/bundler,PG-kura/bundler,MasterLambaster/bundler,pjump/bundler,haonature888/bundler,carpodaster/bundler,elovelan/bundler,haonature/bundler,mpapis/bundler,asymmetric/bundler,CorainChicago/bundler,cowboyd/bundler,agis-/bundler,EthanK28/bundler,jaym/bundler,1337807/bundler,asymmetric/bundler,mvz/bundler,roseweixel/bundler,EthanK28/bundler,Elffers/bundler,steved/bundler,jasonkarns/bundler,bundler/bundler,bronzdoc/bundler,JuanitoFatas/bundler,davydovanton/bundler,mdorrance/bundler,byroot/bundler,ngpestelos/bundler,jingweno/bundler