downgrade rubygems on 1.8
downgrade rubygems on 1.8

works around the regression in loading extensions on 1.8 introduced by
Rubygems 2.2. See also https://github.com/rubygems/rubygems/issues/784

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