Fix bundler git gemspec bug.
Fix bundler git gemspec bug.

Bundler 1.3.0.pre.8 broke backwards compatibility with gemspecs.
6548e31e8ad061403d65505d7d2e17c489b262cc changes how gemspecs are being
generated which is causing problems with git gemspecs that are not self
contained. See https://gist.github.com/hone/5043f02bea633fd1a844 for the
differences in the gemspec.

cmaggard/heroku-buildpack-turbo-sprockets,travis-ci/heroku-buildpack-ruby,cloudn/buildpack-ruby,dleavitt/heroku-buildpack-ruby,AdStage/heroku-buildpack-ruby,codykrieger/heroku-buildpack-jekyll,space150/heroku-buildpack-ruby,dtao/teeny-buildpack,bskyb-commerce/ruby-buildpack,ablease/custom-buildpack,DigitalInnovation/heroku-buildpack-mslabs,leonardykris/mos-ruby-buildpack,zunda/heroku-buildpack-ruby,gls1/heroku-buildpack-ruby-pdftk,derrek/heroku-buildpack-ruby,mperejda/heroku-buildpack-ruby,lemurheavy/heroku-buildpack-ruby,orenyk/heroku-buildpack-ruby,pkgr/buildpack-ruby-precise-old,orlando/heroku-buildpack-ruby,travis-ci/heroku-buildpack-ruby,allomov/fat-free-heroku-buildpack-ruby,righi/instacart-heroku-buildpack,qnyp/heroku-buildpack-ruby-bower,aarongray/heroku-buildpack-ruby,fcruxen/ruby-buildpack,electricobjects/heroku-buildpack-ruby,hatofmonkeys/ruby-testing-buildpack,pkgr/heroku-buildpack-ruby,dleavitt/heroku-buildpack-ruby,ndbroadbent/heroku-buildpack-turbo-sprockets,cordata/heroku-buildpack-ruby,pkgr/heroku-buildpack-ruby,ChefSteps/heroku-buildpack-ruby,rhomobile/heroku-buildpack-ruby,mrhenry/heroku-buildpack-ruby,sstelfox/buildpack-ruby,hatofmonkeys/ruby-testing-buildpack,engineyard/heroku-buildpack-ruby,ibmdb/db2rubybuildpack,hixi/heroku-buildpack-ruby,redhotvengeance/heroku-buildpack-deep-thought,ltrademark/heroku-buildpack-ruby,centresource/heroku-buildpack-turbo-sprockets-pmp-ffm,daltonrenaldo/heroku-buildpack-ruby,ericroberts/heroku-buildpack-ruby,progrium/heroku-buildpack-ruby,iamjarvo/ruby-buildpack,CPPWind/ruby-buildpack,tdenovan/heroku-buildpack-ruby,iamjarvo/ruby-buildpack,tenjikinc/heroku-buildpack-ruby,zidekmat/buildpack-ruby,rhomobile/heroku-buildpack-ruby,ericboehs/heroku-buildpack-ruby,thewebguy/heroku-buildpack-ruby-ffmpeg-libsndfile,hpcloud/ruby-buildpack,Scalingo/ruby-buildpack,ascot21/heroku-buildpack-turbo-sprockets,davidjrice/heroku-buildpack-couchbase-ruby,electricobjects/heroku-buildpack-ruby,hpcloud/heroku-buildpack-ruby,cloudfoundry/ruby-buildpack,takii/heroku-buildpack-ruby,fgbreel/heroku-buildpack-ruby,allomov/fat-free-heroku-buildpack-ruby,catalyzeio/buildpack-ruby,zoomer/heroku-buildpack-ruby-bower,DouglasAllen/heroku-buildpack-ruby,schu/heroku-buildpack-ruby,jeremyvdw/heroku-buildpack-ruby-jekyll,bskyb-commerce/help-heroku-buildpack,guidance-guarantee-programme/heroku-buildpack-princexml-old,reesio/heroku-buildpack-ruby,andycroll/heroku-buildpack-jekyll,ablease/custom-buildpack,thewebguy/heroku-buildpack-ruby-ffmpeg-libsndfile,progrium/heroku-buildpack-ruby,DyegoCosta/heroku-buildpack-ruby,samfrench/heroku-buildpack-ruby,anay/buildpack-ruby-with-oracle-jdk,ekaranto/rails4-bluemix-buildpack,gbenedict/heroku-buildpack-ruby,bskyb-commerce/ruby-buildpack,sky-uk/help-heroku-buildpack,mperejda/heroku-buildpack-ruby,packetmonkey/heroku-buildpack-ruby,guidance-guarantee-programme/heroku-buildpack-princexml-old,trumaker/heroku-buildpack-turbo-sprockets,Jonty/ruby-buildpack,qstream/heroku-buildpack-ruby,pkgr/buildpack-ruby-precise-old,orenyk/heroku-buildpack-ruby,progrium/heroku-buildpack-ruby,swipesense/heroku-buildpack-ruby,gbenedict/heroku-buildpack-ruby,takii/db2rubybuildpack,stefansundin/heroku-buildpack-ruby,d-reinhold/cf-buildpack-ruby,cloudfoundry/ruby-buildpack,zoomer/heroku-buildpack-ruby-bower,musicglue/heroku-buildpack-ruby,hellojustin/heroku-buildpack-custom-ruby,tomwolfe/heroku-buildpack-gsl-ruby,ndbroadbent/heroku-buildpack-turbo-sprockets,moneyadviceservice/heroku-buildpack-ruby-bowndler,rvizza/heroku-buildpack-gsl-ruby,scottatron/moc-buildpack,iamjarvo/ruby-buildpack,crdschurch/heroku-buildpack-ruby,diasks2/heroku-buildpack-mecab,pilotcreative/heroku-buildpack-ruby,dtao/deft-buildpack-ruby,dtao/teeny-buildpack,Altoros/ruby-buildpack,icelab/heroku-buildpack-ruby,zunda/heroku-buildpack-ruby,Jonty/ruby-buildpack,CPPWind/ruby-buildpack,sky-uk/ruby-buildpack,jumptvs/BP_Ruby,ruby/heroku-buildpack-www-ruby-lang,lyoshenka/heroku-buildpack-ruby-jekyll,dtao/deft-buildpack-ruby,davidjrice/heroku-buildpack-couchbase-ruby,pkgr/buildpack-ruby-precise-old,codykrieger/heroku-buildpack-jekyll,donnykurnia/heroku-buildpack-ruby,ibmdb/db2rubybuildpack,mrhenry/heroku-buildpack-ruby,jgable/buildpack-ruby-rack-setup-tasks,sky-uk/help-heroku-buildpack,Genius/heroku-buildpack-ruby,schu/heroku-buildpack-ruby,CPPWind/ruby-buildpack,bskyb-commerce/ruby-buildpack,wolfoo2931/heroku-buildpack-ruby-2a352ae,bellycard/heroku-buildpack-ruby,tpope/heroku-buildpack-ruby-tpope,d-reinhold/cf-buildpack-ruby,CPPWind/ruby-buildpack,bskyb-commerce/help-heroku-buildpack,ablease/custom-buildpack,space150/heroku-buildpack-ruby,hpcloud/ruby-buildpack,wolfoo2931/heroku-buildpack-ruby-2a352ae,schu/buildpack-testing,icelab/heroku-buildpack-ruby,DouglasAllen/heroku-buildpack-ruby,gls1/heroku-buildpack-ruby-pdftk,takii/heroku-buildpack-ruby,Altoros/ruby-buildpack,Genius/heroku-buildpack-ruby,fcruxen/ruby-buildpack,Jonty/ruby-buildpack,hixi/heroku-buildpack-ruby,bskyb-commerce/ruby-buildpack,0x00evil/heroku-buildpack-ruby,Altoros/ruby-buildpack,tomwolfe/heroku-buildpack-gsl-ruby,hellojustin/heroku-buildpack-custom-ruby,lemurheavy/heroku-buildpack-ruby,teodor-pripoae/heroku-buildpack-ruby,jasonlevens/heroku-buildpack-ruby,reesio/heroku-buildpack-ruby,stolt45/heroku-buildpack-ruby-with-sqlite3,centresource/heroku-buildpack-turbo-sprockets-pmp-ffm,instacart/heroku-buildpack-ruby,ibmdb/db2rubybuildpack,takii/db2rubybuildpack,HYPERHYPER/heroku-buildpack-ruby,swipesense/heroku-buildpack-ruby,instacart/heroku-buildpack-ruby,jonasoberschweiber/heroku-buildpack-ruby,blueapron/heroku-buildpack-ruby,tenjikinc/heroku-buildpack-ruby,ablease/custom-buildpack,lemurheavy/heroku-buildpack-ruby,cmaggard/heroku-buildpack-turbo-sprockets,dlorson/gentle-buildpack,cloudfoundry/ruby-buildpack,musicglue/heroku-buildpack-ruby,cloudfoundry/ruby-buildpack,adaptivelab/heroku-buildpack-adaptivelab-website-2,rowanoulton/heroku-buildpack-ruby,cloudControl/buildpack-ruby,sky-uk/ruby-buildpack,mintybit/heroku-buildpack-ruby,bwaite-jaroop/heroku-buildpack-ruby,hpcloud/heroku-buildpack-ruby,moneyadviceservice/heroku-buildpack-ruby-bowndler,jgable/buildpack-ruby-rack-setup-tasks,trumaker/heroku-buildpack-turbo-sprockets,bwaite-jaroop/heroku-buildpack-ruby,Git-Host/prelang-buildpack,jumptvs/BP_Ruby,centresource/heroku-buildpack-turbo-sprockets-pmp-ffm,HYPERHYPER/heroku-buildpack-ruby,makifund/heroku-buildpack-ruby,righi/instacart-heroku-buildpack,Git-Host/prelang-buildpack,tpope/heroku-buildpack-ruby-tpope,dieze/heroku-buildpack-ruby-hooks,makifund/heroku-buildpack-ruby,catalyzeio/buildpack-ruby,brightbytes/heroku-buildpack-ruby-without-assets-precompile,leonardykris/mos-ruby-buildpack,sanemat/heroku-buildpack-ruby-tachikoma,engineyard/heroku-buildpack-ruby,michaelphines/alexa-nest,barakav/heroku-buildpack-ruby,ekaranto/rails4-bluemix-buildpack,phusion/heroku-buildpack-ruby,michaelphines/alexa-nest,Dim25/heroku-buildpack-ruby-GSL,pilotcreative/heroku-buildpack-ruby,hpcloud/ruby-buildpack,dieze/heroku-buildpack-ruby-hooks,recursecenter/heroku-buildpack-ruby,rvizza/heroku-buildpack-gsl-ruby,ChefSteps/heroku-buildpack-ruby,vhx/heroku-buildpack,mattmanning/heroku-buildpack-ruby-jekyll,adaptivelab/heroku-buildpack-adaptivelab-website-2,d-reinhold/cf-buildpack-ruby,heroku/heroku-buildpack-ruby,jeremyvdw/heroku-buildpack-ruby-jekyll,scottatron/moc-buildpack,erintherad/heroku-buildpack-ruby,Altoros/ruby-buildpack,jayshreeanand/heroku-buildpack-ruby,fgbreel/heroku-buildpack-ruby,ActiveState/heroku-buildpack-ruby,phusion/heroku-buildpack-ruby,markaschneider/heroku-buildpack-ruby-ffmpeg-sox,ilpoldo/heroku-buildpack-ruby,Micka33/heroku-buildpack-ruby-liblua,dlorson/gentle-buildpack,diasks2/heroku-buildpack-mecab,bellycard/heroku-buildpack-ruby,cloudn/buildpack-ruby,gls1/heroku-buildpack-ruby-pdftk-new,sky-uk/ruby-buildpack,zidekmat/buildpack-ruby,lyoshenka/heroku-buildpack-ruby-jekyll,aarongray/heroku-buildpack-ruby,daltonrenaldo/heroku-buildpack-ruby,rowanoulton/heroku-buildpack-ruby,cloudn/buildpack-ruby,sstelfox/buildpack-ruby,awebneck/heroku-buildpack-canvas,sanemat/heroku-buildpack-ruby-tachikoma,jonasoberschweiber/heroku-buildpack-ruby,fcruxen/ruby-buildpack,cloudn/buildpack-ruby,ActiveState/heroku-buildpack-ruby,beydogan/ruby-buildpack,shuber/heroku-buildpack-ruby,cordata/heroku-buildpack-ruby,stolt45/heroku-buildpack-ruby-with-sqlite3,AdStage/heroku-buildpack-ruby,simonnordberg/heroku-buildpack-ruby,iamjarvo/ruby-buildpack,barakav/heroku-buildpack-ruby,amaltson/heroku-buildpack-ruby,qnyp/heroku-buildpack-ruby-bower,ltrademark/heroku-buildpack-ruby,amaltson/heroku-buildpack-ruby,jasonlevens/heroku-buildpack-ruby,ekaranto/rails4-bluemix-buildpack,samfrench/heroku-buildpack-ruby,awebneck/heroku-buildpack-canvas,davidjrice/heroku-buildpack-couchbase-ruby,markaschneider/heroku-buildpack-ruby-ffmpeg-sox,heroku/heroku-buildpack-ruby,ericroberts/heroku-buildpack-ruby,mintybit/heroku-buildpack-ruby,ilpoldo/heroku-buildpack-ruby,anay/buildpack-ruby-with-oracle-jdk,Micka33/heroku-buildpack-ruby-liblua,wakermahmud/heroku-buildpack-jekyll,cloudControl/buildpack-ruby,ericboehs/heroku-buildpack-ruby,mattwalters/heroku-buildpack-ruby,Nedomas/heroku-buildpack-ruby-minus-node-with-node-paths,ekaranto/rails4-bluemix-buildpack,wakermahmud/heroku-buildpack-jekyll,KoanHealth/heroku-buildpack-marvin-setup,pietrop/heroku-buildpack-ruby,schu/buildpack-testing,hatofmonkeys/ruby-testing-buildpack,sky-uk/ruby-buildpack,Jonty/ruby-buildpack,hpcloud/ruby-buildpack,crdschurch/heroku-buildpack-ruby,redhotvengeance/heroku-buildpack-deep-thought,andycroll/heroku-buildpack-jekyll,takii/db2rubybuildpack,phusion/heroku-buildpack-ruby,jonseaberg/heroku-buildpack-turbo-sprockets,0x00evil/heroku-buildpack-ruby,jumptvs/BP_Ruby,shuber/heroku-buildpack-ruby,KoanHealth/heroku-buildpack-marvin-setup,packetmonkey/heroku-buildpack-ruby,simonnordberg/heroku-buildpack-ruby,Nedomas/heroku-buildpack-ruby-minus-node-with-node-paths,Dim25/heroku-buildpack-ruby-GSL,beydogan/ruby-buildpack,ascot21/heroku-buildpack-turbo-sprockets,teodor-pripoae/heroku-buildpack-ruby,jumptvs/BP_Ruby,Scalingo/ruby-buildpack,stefansundin/heroku-buildpack-ruby,mattmanning/heroku-buildpack-ruby-jekyll,orlando/heroku-buildpack-ruby,mattwalters/heroku-buildpack-ruby,travis-ci/heroku-buildpack-ruby,DyegoCosta/heroku-buildpack-ruby,takii/db2rubybuildpack,brightbytes/heroku-buildpack-ruby-without-assets-precompile,fcruxen/ruby-buildpack,jayshreeanand/heroku-buildpack-ruby,jonseaberg/heroku-buildpack-turbo-sprockets,recursecenter/heroku-buildpack-ruby,blueapron/heroku-buildpack-ruby,derrek/heroku-buildpack-ruby,pietrop/heroku-buildpack-ruby,vhx/heroku-buildpack,erintherad/heroku-buildpack-ruby,tdenovan/heroku-buildpack-ruby,donnykurnia/heroku-buildpack-ruby,gls1/heroku-buildpack-ruby-pdftk-new,AdStage/heroku-buildpack-ruby,DigitalInnovation/heroku-buildpack-mslabs,cloudfoundry/ruby-buildpack,qstream/heroku-buildpack-ruby,sanemat/heroku-buildpack-ruby-tachikoma