stop using bundle show for detecting gems
stop using bundle show for detecting gems

doing this so we can detect in case bundle install fails

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