Revert "dynamic slug_vendor_base detection code"
Revert "dynamic slug_vendor_base detection code"

This reverts commit 281624256d330e24b04a3fb65cf9d23752cc6c26.

blueapron/heroku-buildpack-ruby,bskyb-commerce/ruby-buildpack,tpope/heroku-buildpack-ruby-tpope,cmaggard/heroku-buildpack-turbo-sprockets,bellycard/heroku-buildpack-ruby,thirdprestige/heroku-buildpack-ruby,pietrop/heroku-buildpack-ruby,fcruxen/ruby-buildpack,dtao/teeny-buildpack,markaschneider/heroku-buildpack-ruby-ffmpeg-sox,crdschurch/heroku-buildpack-ruby,zidekmat/buildpack-ruby,travis-ci/heroku-buildpack-ruby,sstelfox/buildpack-ruby,shuber/heroku-buildpack-ruby,barakav/heroku-buildpack-ruby,mattmanning/heroku-buildpack-ruby-jekyll,musicglue/heroku-buildpack-ruby,rowanoulton/heroku-buildpack-ruby,mrhenry/heroku-buildpack-ruby,pavgup/heroku-buildpack-ruby-lateslugignore,WilliamDenniss/heroku-buildpack-ruby-imagemagick,bskyb-commerce/ruby-buildpack,dtao/deft-buildpack-ruby,ericroberts/heroku-buildpack-ruby,stolt45/heroku-buildpack-ruby-with-sqlite3,Numerico/heroku-buildpack-ruby,12spokes/heroku-buildpack-ruby-imagemagick,ekaranto/rails4-bluemix-buildpack,takii/heroku-buildpack-ruby,cloudControl/buildpack-ruby,codykrieger/heroku-buildpack-jekyll,ruby/heroku-buildpack-www-ruby-lang,derrek/heroku-buildpack-ruby,beydogan/ruby-buildpack,schu/buildpack-testing,DyegoCosta/heroku-buildpack-ruby,qstream/heroku-buildpack-ruby,DigitalInnovation/heroku-buildpack-mslabs,Altoros/ruby-buildpack,diasks2/heroku-buildpack-mecab,ablease/custom-buildpack,centresource/heroku-buildpack-turbo-sprockets-pmp-ffm,Genius/heroku-buildpack-ruby,orlando/heroku-buildpack-ruby,jumptvs/BP_Ruby,amaltson/heroku-buildpack-ruby,wycats/heroku-buildpack-middleman,stolt45/heroku-buildpack-ruby-with-sqlite3,Jonty/ruby-buildpack,iamjarvo/ruby-buildpack,orenyk/heroku-buildpack-ruby,mperejda/heroku-buildpack-ruby,lemurheavy/heroku-buildpack-ruby,aarongray/heroku-buildpack-ruby,Jonty/ruby-buildpack,ekaranto/rails4-bluemix-buildpack,nicholasmott/heroku-buildpack-octopress,zidekmat/buildpack-ruby,HYPERHYPER/heroku-buildpack-ruby,sanemat/heroku-buildpack-ruby-tachikoma,jumptvs/BP_Ruby,DigitalInnovation/heroku-buildpack-mslabs,jgarber/heroku-buildpack-ruby-octopress,wolfoo2931/heroku-buildpack-ruby-2a352ae,Numerico/heroku-buildpack-ruby,travis-ci/heroku-buildpack-ruby,ascot21/heroku-buildpack-turbo-sprockets,joshco/heroku-buildpack-ruby,adaptivelab/heroku-buildpack-adaptivelab-website-2,reesio/heroku-buildpack-ruby,leonardykris/mos-ruby-buildpack,jonseaberg/heroku-buildpack-turbo-sprockets,millie/heroku-buildpack-ruby-with-pdftk,Git-Host/prelang-buildpack,andycroll/heroku-buildpack-jekyll,allomov/fat-free-heroku-buildpack-ruby,Altoros/ruby-buildpack,Jonty/ruby-buildpack,jgarber/heroku-buildpack-ruby-octopress,WilliamDenniss/heroku-buildpack-ruby-imagemagick,samfrench/heroku-buildpack-ruby,amaltson/heroku-buildpack-ruby,ibmdb/db2rubybuildpack,schu/buildpack-testing,qnyp/heroku-buildpack-ruby-bower,KoanHealth/heroku-buildpack-marvin-setup,space150/heroku-buildpack-ruby,Scalingo/ruby-buildpack,cloudfoundry/ruby-buildpack,wakermahmud/heroku-buildpack-jekyll,pkgr/buildpack-ruby-precise-old,lemurheavy/heroku-buildpack-ruby,daltonrenaldo/heroku-buildpack-ruby,mattwalters/heroku-buildpack-ruby,iamjarvo/ruby-buildpack,nthj/heroku-buildpack-mirror,andycroll/heroku-buildpack-jekyll,ltrademark/heroku-buildpack-ruby,samfrench/heroku-buildpack-ruby,jeremyvdw/heroku-buildpack-ruby-jekyll,lemurheavy/heroku-buildpack-ruby,pilotcreative/heroku-buildpack-ruby,mperejda/heroku-buildpack-ruby,bskyb-commerce/help-heroku-buildpack,pilotcreative/heroku-buildpack-ruby,jayshreeanand/heroku-buildpack-ruby,pietrop/heroku-buildpack-ruby,takii/db2rubybuildpack,dieze/heroku-buildpack-ruby-hooks,jcamenisch/heroku-buildpack-rgeo,DouglasAllen/heroku-buildpack-ruby,rvizza/heroku-buildpack-gsl-ruby,icelab/heroku-buildpack-ruby,phusion/heroku-buildpack-ruby,hausdorff/heroku-buildpack-ruby-jekyll,rowanoulton/heroku-buildpack-ruby,cloudn/buildpack-ruby,donnykurnia/heroku-buildpack-ruby,cloudfoundry/ruby-buildpack,reesio/heroku-buildpack-ruby,Scalingo/ruby-buildpack,bwaite-jaroop/heroku-buildpack-ruby,righi/instacart-heroku-buildpack,firmhouse/heroku-buildpack-ruby-freetds,atmos/heroku-buildpack-ruby,jeremyvdw/heroku-buildpack-ruby-jekyll,iamjarvo/ruby-buildpack,jumptvs/BP_Ruby,mattmanning/heroku-buildpack-ruby-jekyll,jayshreeanand/heroku-buildpack-ruby,meskyanichi/heroku-buildpack-middleman,gls1/heroku-buildpack-ruby-pdftk-new,aarongray/heroku-buildpack-ruby,CPPWind/ruby-buildpack,hellojustin/heroku-buildpack-custom-ruby,engineyard/heroku-buildpack-ruby,blueapron/heroku-buildpack-ruby,codykrieger/heroku-buildpack-jekyll,hone/heroku-buildpack-ruby,guidance-guarantee-programme/heroku-buildpack-princexml-old,anay/buildpack-ruby-with-oracle-jdk,CPPWind/ruby-buildpack,ascot21/heroku-buildpack-turbo-sprockets,12spokes/heroku-buildpack-ruby-imagemagick,pavgup/heroku-buildpack-ruby-lateslugignore,gbenedict/heroku-buildpack-ruby,erintherad/heroku-buildpack-ruby,hausdorff/heroku-buildpack-ruby-jekyll,jglascoe/heroku-buildpack-ruby-jekyll,travis-ci/heroku-buildpack-ruby,sgnpa/heroku-buildpack-cas,AJamesPhillips/heroku-buildpack-ruby,ekaranto/rails4-bluemix-buildpack,Genius/heroku-buildpack-ruby,lyoshenka/heroku-buildpack-ruby-jekyll,cloudn/buildpack-ruby,ekaranto/rails4-bluemix-buildpack,tenjikinc/heroku-buildpack-ruby,meskyanichi/heroku-buildpack-middleman,sky-uk/ruby-buildpack,makifund/heroku-buildpack-ruby,simonnordberg/heroku-buildpack-ruby,gls1/heroku-buildpack-ruby-pdftk-new,ndbroadbent/heroku-buildpack-turbo-sprockets,barakav/heroku-buildpack-ruby,bellycard/heroku-buildpack-ruby,jgable/buildpack-ruby-rack-setup-tasks,CPPWind/ruby-buildpack,diasks2/heroku-buildpack-mecab,ablease/custom-buildpack,mintybit/heroku-buildpack-ruby,icelab/heroku-buildpack-ruby,sanemat/heroku-buildpack-ruby-tachikoma,leonardykris/mos-ruby-buildpack,gls1/heroku-buildpack-ruby-pdftk,ablease/custom-buildpack,hpcloud/heroku-buildpack-ruby,darron/heroku-buildpack-ruby-jekyll,scottatron/moc-buildpack,jgarber/heroku-buildpack-ruby-octopress,teodor-pripoae/heroku-buildpack-ruby,hellojustin/heroku-buildpack-custom-ruby,rstacruz/heroku-buildpack-middleman,Altoros/ruby-buildpack,swipesense/heroku-buildpack-ruby,jonasoberschweiber/heroku-buildpack-ruby,dlorson/gentle-buildpack,jasonlevens/heroku-buildpack-ruby,moneyadviceservice/heroku-buildpack-ruby-bowndler,d-reinhold/cf-buildpack-ruby,hatofmonkeys/ruby-testing-buildpack,ibmdb/db2rubybuildpack,Micka33/heroku-buildpack-ruby-liblua,phusion/heroku-buildpack-ruby,guidance-guarantee-programme/heroku-buildpack-princexml-old,Numerico/heroku-buildpack-ruby,ilpoldo/heroku-buildpack-ruby,jonasoberschweiber/heroku-buildpack-ruby,michaelphines/alexa-nest,nicholasmott/heroku-buildpack-octopress,schu/heroku-buildpack-ruby,sgnpa/heroku-buildpack-cas,fcruxen/ruby-buildpack,rvizza/heroku-buildpack-gsl-ruby,hone/heroku-buildpack-ruby,zunda/heroku-buildpack-ruby,takii/db2rubybuildpack,ChefSteps/heroku-buildpack-ruby,pavgup/heroku-buildpack-ruby-lateslugignore,swipesense/heroku-buildpack-ruby,DouglasAllen/heroku-buildpack-ruby,ibmdb/db2rubybuildpack,Jonty/ruby-buildpack,thirdprestige/heroku-buildpack-ruby,cordata/heroku-buildpack-ruby,pkgr/heroku-buildpack-ruby,gbenedict/heroku-buildpack-ruby,Nedomas/heroku-buildpack-ruby-minus-node-with-node-paths,zoomer/heroku-buildpack-ruby-bower,anay/buildpack-ruby-with-oracle-jdk,fcruxen/ruby-buildpack,sstelfox/buildpack-ruby,HYPERHYPER/heroku-buildpack-ruby,tdenovan/heroku-buildpack-ruby,d-reinhold/cf-buildpack-ruby,ActiveState/heroku-buildpack-ruby,progrium/heroku-buildpack-ruby,trumaker/heroku-buildpack-turbo-sprockets,awebneck/heroku-buildpack-canvas,Nedomas/heroku-buildpack-ruby-minus-node-with-node-paths,tenjikinc/heroku-buildpack-ruby,AdStage/heroku-buildpack-ruby,beydogan/ruby-buildpack,hixi/heroku-buildpack-ruby,stefansundin/heroku-buildpack-ruby,instacart/heroku-buildpack-ruby,lyoshenka/heroku-buildpack-ruby-jekyll,millie/heroku-buildpack-ruby-with-pdftk,cloudfoundry/ruby-buildpack,thewebguy/heroku-buildpack-ruby-ffmpeg-libsndfile,thewebguy/heroku-buildpack-ruby-ffmpeg-libsndfile,AdStage/heroku-buildpack-ruby,WilliamDenniss/heroku-buildpack-ruby-imagemagick,catalyzeio/buildpack-ruby,crdschurch/heroku-buildpack-ruby,sky-uk/ruby-buildpack,nthj/heroku-buildpack-mirror,mattwalters/heroku-buildpack-ruby,tpope/heroku-buildpack-ruby-tpope,fgbreel/heroku-buildpack-ruby,rstacruz/heroku-buildpack-middleman,makifund/heroku-buildpack-ruby,centresource/heroku-buildpack-turbo-sprockets-pmp-ffm,sky-uk/ruby-buildpack,fgbreel/heroku-buildpack-ruby,vhx/heroku-buildpack,simonnordberg/heroku-buildpack-ruby,shuber/heroku-buildpack-ruby,progrium/heroku-buildpack-ruby,cloudn/buildpack-ruby,packetmonkey/heroku-buildpack-ruby,davidjrice/heroku-buildpack-couchbase-ruby,daltonrenaldo/heroku-buildpack-ruby,ltrademark/heroku-buildpack-ruby,bskyb-commerce/ruby-buildpack,takii/db2rubybuildpack,firmhouse/heroku-buildpack-ruby-freetds,nicholasmott/heroku-buildpack-octopress,cordata/heroku-buildpack-ruby,AJamesPhillips/heroku-buildpack-ruby,pcincalifornia/wdc-heroku-buildpack-middleman,pkgr/buildpack-ruby-precise-old,darron/heroku-buildpack-ruby-jekyll,markaschneider/heroku-buildpack-ruby-ffmpeg-sox,bwaite-jaroop/heroku-buildpack-ruby,CPPWind/ruby-buildpack,cloudControl/buildpack-ruby,qnyp/heroku-buildpack-ruby-bower,dtao/deft-buildpack-ruby,hpcloud/ruby-buildpack,ejholmes/heroku-buildpack-middleman,redhotvengeance/heroku-buildpack-deep-thought,righi/instacart-heroku-buildpack,hpcloud/ruby-buildpack,sky-uk/ruby-buildpack,hatofmonkeys/ruby-testing-buildpack,heroku/heroku-buildpack-ruby,jgable/buildpack-ruby-rack-setup-tasks,pkgr/buildpack-ruby-precise-old,bskyb-commerce/help-heroku-buildpack,Altoros/ruby-buildpack,electricobjects/heroku-buildpack-ruby,dtao/teeny-buildpack,gls1/heroku-buildpack-ruby-pdftk,hatofmonkeys/ruby-testing-buildpack,musicglue/heroku-buildpack-ruby,stefansundin/heroku-buildpack-ruby,scottatron/moc-buildpack,rhomobile/heroku-buildpack-ruby,michaelphines/alexa-nest,mintybit/heroku-buildpack-ruby,KoanHealth/heroku-buildpack-marvin-setup,tomwolfe/heroku-buildpack-gsl-ruby,pkgr/heroku-buildpack-ruby,thirdprestige/heroku-buildpack-ruby,jasonlevens/heroku-buildpack-ruby,jcamenisch/heroku-buildpack-rgeo,instacart/heroku-buildpack-ruby,moneyadviceservice/heroku-buildpack-ruby-bowndler,dleavitt/heroku-buildpack-ruby,dieze/heroku-buildpack-ruby-hooks,allomov/fat-free-heroku-buildpack-ruby,takii/heroku-buildpack-ruby,fcruxen/ruby-buildpack,donnykurnia/heroku-buildpack-ruby,atmos/heroku-buildpack-ruby,0x00evil/heroku-buildpack-ruby,DyegoCosta/heroku-buildpack-ruby,ilpoldo/heroku-buildpack-ruby,davidjrice/heroku-buildpack-couchbase-ruby,progrium/heroku-buildpack-ruby,ericboehs/heroku-buildpack-ruby,tdenovan/heroku-buildpack-ruby,cloudn/buildpack-ruby,vhx/heroku-buildpack,brightbytes/heroku-buildpack-ruby-without-assets-precompile,adaptivelab/heroku-buildpack-adaptivelab-website-2,cloudfoundry/ruby-buildpack,jglascoe/heroku-buildpack-ruby-jekyll,AJamesPhillips/heroku-buildpack-ruby,firmhouse/heroku-buildpack-ruby-freetds,Dim25/heroku-buildpack-ruby-GSL,orenyk/heroku-buildpack-ruby,orlando/heroku-buildpack-ruby,teodor-pripoae/heroku-buildpack-ruby,hpcloud/heroku-buildpack-ruby,jonseaberg/heroku-buildpack-turbo-sprockets,sgnpa/heroku-buildpack-cas,Micka33/heroku-buildpack-ruby-liblua,tomwolfe/heroku-buildpack-gsl-ruby,0x00evil/heroku-buildpack-ruby,dleavitt/heroku-buildpack-ruby,bskyb-commerce/ruby-buildpack,d-reinhold/cf-buildpack-ruby,heroku/heroku-buildpack-ruby,wycats/heroku-buildpack-middleman,ablease/custom-buildpack,space150/heroku-buildpack-ruby,wakermahmud/heroku-buildpack-jekyll,recursecenter/heroku-buildpack-ruby,sky-uk/help-heroku-buildpack,iamjarvo/ruby-buildpack,electricobjects/heroku-buildpack-ruby,davidjrice/heroku-buildpack-couchbase-ruby,ChefSteps/heroku-buildpack-ruby,dlorson/gentle-buildpack,ActiveState/heroku-buildpack-ruby,cloudfoundry/ruby-buildpack,brightbytes/heroku-buildpack-ruby-without-assets-precompile,trumaker/heroku-buildpack-turbo-sprockets,cmaggard/heroku-buildpack-turbo-sprockets,atmos/heroku-buildpack-ruby,rhomobile/heroku-buildpack-ruby,jumptvs/BP_Ruby,wolfoo2931/heroku-buildpack-ruby-2a352ae,awebneck/heroku-buildpack-canvas,hixi/heroku-buildpack-ruby,catalyzeio/buildpack-ruby,hpcloud/ruby-buildpack,pcincalifornia/wdc-heroku-buildpack-middleman,erintherad/heroku-buildpack-ruby,centresource/heroku-buildpack-turbo-sprockets-pmp-ffm,qstream/heroku-buildpack-ruby,engineyard/heroku-buildpack-ruby,ericboehs/heroku-buildpack-ruby,ericroberts/heroku-buildpack-ruby,Dim25/heroku-buildpack-ruby-GSL,ndbroadbent/heroku-buildpack-turbo-sprockets,takii/db2rubybuildpack,sanemat/heroku-buildpack-ruby-tachikoma,phusion/heroku-buildpack-ruby,ejholmes/heroku-buildpack-middleman,hpcloud/ruby-buildpack,Git-Host/prelang-buildpack,redhotvengeance/heroku-buildpack-deep-thought,packetmonkey/heroku-buildpack-ruby,schu/heroku-buildpack-ruby,sky-uk/help-heroku-buildpack,AdStage/heroku-buildpack-ruby,derrek/heroku-buildpack-ruby,zoomer/heroku-buildpack-ruby-bower,recursecenter/heroku-buildpack-ruby,zunda/heroku-buildpack-ruby,mrhenry/heroku-buildpack-ruby,joshco/heroku-buildpack-ruby