Use command instead of which for apt-get existential check in bootstrap.sh
Use command instead of which for apt-get existential check in bootstrap.sh

vfulco/dokku-alt,netbrick/dokku,elia/dokku,mouserage/dokku,davidsiefert/dokku,mehulsbhatt/dokku-alt,mmerickel/dokku,vfulco/dokku-alt,Fab-IT-ApS/dokku,biddyweb/dokku,suxor42/dokku,gianpaj/dokku,barseghyanartur/dokku,kennetham/dokku,Evlos/dokku,davidsiefert/dokku,Evlos/dokku,tilgovi/dokku,mehulsbhatt/dokku-alt,beedesk/dokku,TribeMedia/dokku,claytonbrown/dokku,vijayviji/dokku,mouserage/dokku,jazzzz/dokku,elia/dokku,econya/dokku,alexquick/dokku,amaltson/dokku,leonardodino/dokku,basicer/dokku,jazzzz/dokku,claytonbrown/dokku,ertrzyiks/dokku,AnselZhangGit/dokku,jamesblunt/dokku,jamesblunt/dokku,sseemayer/dokku,crisward/dokku,claytonbrown/dokku,Cactusbone/dokku,klodoo/dokku,cjblomqvist/dokku,TribeMedia/dokku,matto1990/dokku,vijayviji/dokku,dokku-alt/dokku-alt,fruitl00p/dokku,netbrick/dokku-alt,tilgovi/dokku,mrluc/dokku,barseghyanartur/dokku,Evlos/dokku,lmars/dokku,suxor42/dokku,suxor42/dokku,experimental-platform/dokku,emdantrim/dokku,ertrzyiks/dokku,Fab-IT-ApS/dokku,AnselZhangGit/dokku,netbrick/dokku,kennetham/dokku,dsrowell/dokku-alt,fruitl00p/dokku,dokku-alt/dokku-alt,expa/dokku,TribeMedia/dokku,emdantrim/dokku,progrium/dokku,bobvanderlinden/dokku,sseemayer/dokku,lmars/dokku,alessio/dokku,sebastianscatularo/dokku,beedesk/dokku-alt,codeconfab/dokku,ebeigarts/dokku,paralin/crew,TribeMedia/dokku,experimental-platform/dokku,beni55/dokku,mrluc/dokku,akatrevorjay/dokku,netbrick/dokku-alt,suxor42/dokku,kennetham/dokku,biddyweb/dokku,eljojo/dokku,akatrevorjay/dokku,rocLv/dokku,mrluc/dokku,econya/dokku,vijayviji/dokku,omeid/dokku,vlipco/dokku,leonardodino/dokku,experimental-platform/dokku,matto1990/dokku,dokku/dokku,elia/dokku,mouserage/dokku,jimeh/dokku,Evlos/dokku,barseghyanartur/dokku,mouserage/dokku,henrik/dokku,henrik/dokku,dokku/dokku,stepri/dokku,stnly/dokku-alt,vlipco/dokku,u2mejc/dokku,jamesmarva/dokku,callahad/dokku,hanwoody/dokku,hanwoody/dokku,tilgovi/dokku,matto1990/dokku,vijayviji/dokku,Evlos/dokku,arthurschreiber/dokku,jimjag/dokku,biddyweb/dokku,econya/dokku,lmars/dokku,klodoo/dokku,jamesblunt/dokku,ebeigarts/dokku,elia/dokku,vijayviji/dokku,beedesk/dokku,alessio/dokku,omeid/dokku,alexquick/dokku,pmvieira/dokku,beedesk/dokku-alt,TribeMedia/dokku,davidsiefert/dokku,davidsiefert/dokku,ebeigarts/dokku,claytonbrown/dokku,kennetham/dokku,jimjag/dokku,progrium/dokku,expa/dokku,vfulco/dokku-alt,stnly/dokku-alt,netbrick/dokku,matto1990/dokku,fmoliveira/dokku,3onyc/dokku,arthurschreiber/dokku,jimeh/dokku,eljojo/dokku,u2mejc/dokku,callahad/dokku,jazzzz/dokku,dsrowell/dokku-alt,biddyweb/dokku,ddreaml/dokku,ertrzyiks/dokku,Evlos/dokku,klodoo/dokku,tilgovi/dokku,jamesmarva/dokku,rocLv/dokku,barseghyanartur/dokku,frog/dokku,frog/dokku,callahad/dokku,crisward/dokku,lmars/dokku,codeconfab/dokku,emdantrim/dokku,Cactusbone/dokku,codeconfab/dokku,dsrowell/dokku-alt,netbrick/dokku,jimeh/dokku,davidsiefert/dokku,bewest/dokku-alt,emdantrim/dokku,mouserage/dokku,ddreaml/dokku,pmvieira/dokku,AnselZhangGit/dokku,vkurup/dokku,ebeigarts/dokku,tilgovi/dokku,amaltson/dokku,alessio/dokku,vkurup/dokku,alessio/dokku,stnly/dokku-alt,u2mejc/dokku,vkurup/dokku,Evlos/dokku,barseghyanartur/dokku,arsthanea/dokku,paralin/crew,biddyweb/dokku,pmvieira/dokku,akatrevorjay/dokku,stnly/dokku-alt,jamesmarva/dokku,dokku/dokku,Fab-IT-ApS/dokku,arsthanea/dokku,AnselZhangGit/dokku,vkurup/dokku,crisward/dokku,claytonbrown/dokku,vkurup/dokku,jimjag/dokku,vfulco/dokku-alt,biddyweb/dokku,omeid/dokku,progrium/dokku,econya/dokku,beni55/dokku,bkniffler/dokku,akatrevorjay/dokku,stnly/dokku-alt,hanwoody/dokku,Git-Host/dokku,econya/dokku,cjblomqvist/dokku,gianpaj/dokku,beni55/dokku,hanwoody/dokku,klodoo/dokku,jazzzz/dokku,sseemayer/dokku,stepri/dokku,3onyc/dokku,johnfraney/dokku,bobvanderlinden/dokku,u2mejc/dokku,henrik/dokku,AnselZhangGit/dokku,netbrick/dokku-alt,alexquick/dokku,akatrevorjay/dokku,callahad/dokku,mmerickel/dokku,davidsiefert/dokku,leonardodino/dokku,expa/dokku,basicer/dokku,claytonbrown/dokku,ertrzyiks/dokku,codeconfab/dokku,matto1990/dokku,sseemayer/dokku,bewest/dokku-alt,netbrick/dokku,mrluc/dokku,crisward/dokku,claytonbrown/dokku,Git-Host/dokku,jimeh/dokku,vlipco/dokku,Fab-IT-ApS/dokku,mrluc/dokku,amaltson/dokku,fruitl00p/dokku,henrik/dokku,dsrowell/dokku-alt,arsthanea/dokku,vkurup/dokku,vfulco/dokku-alt,econya/dokku,ertrzyiks/dokku,beedesk/dokku-alt,biddyweb/dokku,kennetham/dokku,Cactusbone/dokku,barseghyanartur/dokku,arsthanea/dokku,johnfraney/dokku,fruitl00p/dokku,mrluc/dokku,progrium/dokku,crisward/dokku,TribeMedia/dokku,sebastianscatularo/dokku,dokku-alt/dokku-alt,gianpaj/dokku,eljojo/dokku,ddreaml/dokku,alexquick/dokku,klodoo/dokku,vfulco/dokku-alt,eljojo/dokku,mmerickel/dokku,expa/dokku,fmoliveira/dokku,beedesk/dokku-alt,Git-Host/dokku,sebastianscatularo/dokku,callahad/dokku,beedesk/dokku,Fab-IT-ApS/dokku,mmerickel/dokku,alexquick/dokku,jamesmarva/dokku,basicer/dokku,beni55/dokku,akatrevorjay/dokku,arsthanea/dokku,claytonbrown/dokku,Git-Host/dokku,crisward/dokku,progrium/dokku,matto1990/dokku,fmoliveira/dokku,omeid/dokku,bkniffler/dokku,mouserage/dokku,ertrzyiks/dokku,rocLv/dokku,amaltson/dokku,sseemayer/dokku,elia/dokku,henrik/dokku,sebastianscatularo/dokku,bkniffler/dokku,progrium/dokku,akatrevorjay/dokku,3onyc/dokku,codeconfab/dokku,fruitl00p/dokku,leonardodino/dokku,jimjag/dokku,dsrowell/dokku-alt,alessio/dokku,jazzzz/dokku,fruitl00p/dokku,emdantrim/dokku,pmvieira/dokku,jamesmarva/dokku,jimjag/dokku,cjblomqvist/dokku,lmars/dokku,dokku/dokku,progrium/dokku,Git-Host/dokku,Fab-IT-ApS/dokku,beedesk/dokku,beedesk/dokku,fmoliveira/dokku,amaltson/dokku,mrluc/dokku,fmoliveira/dokku,ddreaml/dokku,jazzzz/dokku,frog/dokku,kennetham/dokku,mmerickel/dokku,jimjag/dokku,alexquick/dokku,callahad/dokku,klodoo/dokku,hanwoody/dokku,ddreaml/dokku,frog/dokku,cjblomqvist/dokku,vfulco/dokku-alt,johnfraney/dokku,emdantrim/dokku,fmoliveira/dokku,callahad/dokku,ddreaml/dokku,klodoo/dokku,ebeigarts/dokku,Git-Host/dokku,AnselZhangGit/dokku,expa/dokku,sseemayer/dokku,experimental-platform/dokku,gianpaj/dokku,beni55/dokku,basicer/dokku,jimeh/dokku,dokku-alt/dokku-alt,bewest/dokku-alt,jazzzz/dokku,jimeh/dokku,amaltson/dokku,bkniffler/dokku,basicer/dokku,dokku/dokku,Evlos/dokku,jimeh/dokku,stepri/dokku,alessio/dokku,leonardodino/dokku,dokku/dokku,stnly/dokku-alt,mehulsbhatt/dokku-alt,cjblomqvist/dokku,jamesmarva/dokku,mouserage/dokku,jamesmarva/dokku,emdantrim/dokku,dsrowell/dokku-alt,bkniffler/dokku,dokku/dokku,kennetham/dokku,3onyc/dokku,rocLv/dokku,eljojo/dokku,rocLv/dokku,bobvanderlinden/dokku,beni55/dokku,johnfraney/dokku,expa/dokku,beedesk/dokku,mmerickel/dokku,experimental-platform/dokku,leonardodino/dokku,alessio/dokku,henrik/dokku,beedesk/dokku-alt,jazzzz/dokku,experimental-platform/dokku,bkniffler/dokku,fruitl00p/dokku,gianpaj/dokku,johnfraney/dokku,netbrick/dokku,dsrowell/dokku-alt,lmars/dokku,vfulco/dokku-alt,vijayviji/dokku,vkurup/dokku,ebeigarts/dokku,arsthanea/dokku,fmoliveira/dokku,netbrick/dokku-alt,bewest/dokku-alt,3onyc/dokku,elia/dokku,vijayviji/dokku,vijayviji/dokku,hanwoody/dokku,Cactusbone/dokku,gianpaj/dokku,matto1990/dokku,callahad/dokku,johnfraney/dokku,Cactusbone/dokku,cjblomqvist/dokku,bobvanderlinden/dokku,alexquick/dokku,suxor42/dokku,Git-Host/dokku,ddreaml/dokku,3onyc/dokku,netbrick/dokku,mrluc/dokku,bobvanderlinden/dokku,omeid/dokku,bobvanderlinden/dokku,tilgovi/dokku,hanwoody/dokku,suxor42/dokku,3onyc/dokku,rocLv/dokku,eljojo/dokku,econya/dokku,ertrzyiks/dokku,stnly/dokku-alt,codeconfab/dokku,sebastianscatularo/dokku,cjblomqvist/dokku,arthurschreiber/dokku,mehulsbhatt/dokku-alt,netbrick/dokku-alt,basicer/dokku,netbrick/dokku-alt,barseghyanartur/dokku,Cactusbone/dokku,frog/dokku,u2mejc/dokku,TribeMedia/dokku,gianpaj/dokku,codeconfab/dokku,u2mejc/dokku,stepri/dokku,expa/dokku,jimjag/dokku,jamesblunt/dokku,vlipco/dokku,omeid/dokku,TribeMedia/dokku,beedesk/dokku,rocLv/dokku,bkniffler/dokku,hanwoody/dokku,arthurschreiber/dokku,AnselZhangGit/dokku,ebeigarts/dokku,pmvieira/dokku,frog/dokku,jamesblunt/dokku,dokku/dokku,jimjag/dokku,expa/dokku,rocLv/dokku,lmars/dokku,netbrick/dokku-alt,3onyc/dokku,sebastianscatularo/dokku,mmerickel/dokku,bobvanderlinden/dokku,mehulsbhatt/dokku-alt,suxor42/dokku,jimeh/dokku,barseghyanartur/dokku,Fab-IT-ApS/dokku,Cactusbone/dokku,pmvieira/dokku,Git-Host/dokku,beedesk/dokku-alt,tilgovi/dokku,bewest/dokku-alt,progrium/dokku,eljojo/dokku,mmerickel/dokku,beedesk/dokku-alt,bobvanderlinden/dokku,ebeigarts/dokku,frog/dokku,dsrowell/dokku-alt,mouserage/dokku,sseemayer/dokku,beni55/dokku,akatrevorjay/dokku,dokku-alt/dokku-alt,henrik/dokku,beedesk/dokku,dokku-alt/dokku-alt,u2mejc/dokku,pmvieira/dokku,amaltson/dokku,econya/dokku,crisward/dokku,experimental-platform/dokku,stepri/dokku,experimental-platform/dokku,pmvieira/dokku,jamesblunt/dokku,vlipco/dokku,basicer/dokku,dokku-alt/dokku-alt,mehulsbhatt/dokku-alt,amaltson/dokku,johnfraney/dokku,arsthanea/dokku,mehulsbhatt/dokku-alt,AnselZhangGit/dokku,eljojo/dokku,arthurschreiber/dokku,dokku-alt/dokku-alt,leonardodino/dokku,sebastianscatularo/dokku,davidsiefert/dokku,alessio/dokku,stnly/dokku-alt,vlipco/dokku,bewest/dokku-alt,matto1990/dokku,sseemayer/dokku,alexquick/dokku,klodoo/dokku,beedesk/dokku-alt,jamesblunt/dokku,codeconfab/dokku,Cactusbone/dokku,emdantrim/dokku,basicer/dokku,tilgovi/dokku,bkniffler/dokku,ertrzyiks/dokku,vlipco/dokku,Fab-IT-ApS/dokku,u2mejc/dokku,kennetham/dokku,arsthanea/dokku,bewest/dokku-alt,netbrick/dokku-alt,mehulsbhatt/dokku-alt,netbrick/dokku,elia/dokku,crisward/dokku,lmars/dokku,omeid/dokku,fruitl00p/dokku,elia/dokku,biddyweb/dokku,jamesmarva/dokku,suxor42/dokku,stepri/dokku,cjblomqvist/dokku,johnfraney/dokku,sebastianscatularo/dokku,davidsiefert/dokku,vlipco/dokku,bewest/dokku-alt,vkurup/dokku,gianpaj/dokku,stepri/dokku,omeid/dokku,stepri/dokku,henrik/dokku,ddreaml/dokku,arthurschreiber/dokku,fmoliveira/dokku,arthurschreiber/dokku,beni55/dokku,leonardodino/dokku,arthurschreiber/dokku