remove unused Environment#index method
remove unused Environment#index method

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