remove rake tasks that use vulcan
remove rake tasks that use vulcan

the buildpack uses [hammer](http://github.com/hone/hammer)

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