use tests' copy of rake to verify gem tasks
use tests' copy of rake to verify gem tasks

/cc @segiddins

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