Use staging environment for ruby buildpack
Use staging environment for ruby buildpack

cloudn/buildpack-ruby,cloudfoundry/ruby-buildpack,d-reinhold/cf-buildpack-ruby,ekaranto/rails4-bluemix-buildpack,takii/db2rubybuildpack,iamjarvo/ruby-buildpack,Altoros/ruby-buildpack,takii/db2rubybuildpack,ekaranto/rails4-bluemix-buildpack,cloudfoundry/ruby-buildpack,hpcloud/ruby-buildpack,iamjarvo/ruby-buildpack,Altoros/ruby-buildpack,ActiveState/heroku-buildpack-ruby,Scalingo/ruby-buildpack,hpcloud/heroku-buildpack-ruby,takii/db2rubybuildpack,iamjarvo/ruby-buildpack,ekaranto/rails4-bluemix-buildpack,hatofmonkeys/ruby-testing-buildpack,bskyb-commerce/ruby-buildpack,hatofmonkeys/ruby-testing-buildpack,takii/db2rubybuildpack,bskyb-commerce/ruby-buildpack,Jonty/ruby-buildpack,sky-uk/ruby-buildpack,cloudfoundry/ruby-buildpack,iamjarvo/ruby-buildpack,hatofmonkeys/ruby-testing-buildpack,jumptvs/BP_Ruby,CPPWind/ruby-buildpack,fcruxen/ruby-buildpack,fcruxen/ruby-buildpack,Altoros/ruby-buildpack,ibmdb/db2rubybuildpack,hpcloud/ruby-buildpack,hpcloud/ruby-buildpack,sky-uk/ruby-buildpack,Jonty/ruby-buildpack,cloudn/buildpack-ruby,bskyb-commerce/ruby-buildpack,Jonty/ruby-buildpack,jumptvs/BP_Ruby,Jonty/ruby-buildpack,cloudfoundry/ruby-buildpack,wolfoo2931/heroku-buildpack-ruby-2a352ae,Scalingo/ruby-buildpack,CPPWind/ruby-buildpack,cloudn/buildpack-ruby,wolfoo2931/heroku-buildpack-ruby-2a352ae,hpcloud/ruby-buildpack,fcruxen/ruby-buildpack,sky-uk/ruby-buildpack,cloudfoundry/ruby-buildpack,ablease/custom-buildpack,CPPWind/ruby-buildpack,sky-uk/ruby-buildpack,ibmdb/db2rubybuildpack,d-reinhold/cf-buildpack-ruby,ablease/custom-buildpack,hpcloud/heroku-buildpack-ruby,ibmdb/db2rubybuildpack,CPPWind/ruby-buildpack,fcruxen/ruby-buildpack,Altoros/ruby-buildpack,d-reinhold/cf-buildpack-ruby,jumptvs/BP_Ruby,ablease/custom-buildpack,jumptvs/BP_Ruby,bskyb-commerce/ruby-buildpack,ActiveState/heroku-buildpack-ruby,ablease/custom-buildpack,ekaranto/rails4-bluemix-buildpack,cloudn/buildpack-ruby