use file for downloading b2d iso if no scheme is provided
use file for downloading b2d iso if no scheme is provided

Signed-off-by: Evan Hazlett <7e61ed261aef9abaa71fd4c2127eb6cb9f01ce10@gmail.com>

phiroict/docker,JohnKDay/machine,alindeman/machine,carolynvs/machine,exoscale/docker-machine,bgokden/machine,shubheksha/docker.github.io,vovimayhem/machine,robertbreker/machine,abstractitptyltd/machine,trecloux/machine,slashk/machine,skatsuta/machine,laveolu/machine,emsi/machine,skatsuta/machine,londoncalling/docker.github.io,BSWANG/denverdino.github.io,MHBauer/machine,jkingyens/machine,exoscale/docker-machine,bookerzzz/machine,docker/docker.github.io,johnstep/docker.github.io,jeanlaurent/machine,shot/machine,SvenDowideit/machine,menglingwei/denverdino.github.io,mjtrefethen/machine,Grynn/machine,soleo/machine,thaJeztah/docker.github.io,StackPointCloud/machine,vovimayhem/machine,justintung/machine,pragkent/machine,dudymas/machine,troy0820/docker.github.io,tyrken/machine,menglingwei/denverdino.github.io,jzwlqx/denverdino.github.io,atsaki/machine,shin-/docker.github.io,bdwill/docker.github.io,rowancarr/machine,joeuo/docker.github.io,shubheksha/docker.github.io,surgeforward/machine,davidstosik/machine,joeuo/docker.github.io,joaofnfernandes/docker.github.io,denmat/machine,sausheong/machine,voutilad/machine,faijaz/docker-machine,CenturyLinkLabs/machine,cvstebut/machine,carolynvs/machine,rupakg/machine,shot/machine,thaJeztah/docker.github.io,denverdino/machine,rillig/docker.github.io,dudymas/machine,anweiss/docker.github.io,menglingwei/denverdino.github.io,thaJeztah/machine,miqui/machine,Herbis/machine,zchee/machine,bgokden/machine,dgageot/machine,pragkent/machine,joyent/machine,gerred/machine,tyrken/machine,jmelis/machine,aduermael/docker.github.io,bgokden/machine,pdxjohnny/machine,euank/machine,aperepel/machine,yanzay/machine,danix800/docker.github.io,jpressnell/machine,johnstep/docker.github.io,laveolu/machine,kacole2/machine,shin-/docker.github.io,feelobot/machine,rupakg/machine,docker/docker.github.io,Parallels/docker-machine,danix800/docker.github.io,dweomer/docker-machine,bdwill/docker.github.io,kunalkushwaha/machine,joeuo/docker.github.io,johnstep/docker.github.io,anweiss/docker.github.io,ubiquityhosting/machine,robertbreker/machine,jhoos/machine,miqui/machine,errordeveloper/machine,LuisBosquez/docker.github.io,seegno-forks/machine,feelobot/machine,rdgreis/machine,evq/machine,joaofnfernandes/docker.github.io,LaynePeng/machine,BSWANG/denverdino.github.io,BSWANG/denverdino.github.io,usmanismail/machine,gerred/machine,larsla/machine,jgsqware/machine,yanzay/machine,sanscontext/docker.github.io,carloreggiani/machine,bwahn/machine,denverdino/docker.github.io,hypriot/machine,SvenDowideit/machine,moxiegirl/machine,wlan0/machine,justintung/machine,juliengarcia/machine,deitch/machine,docker/docker.github.io,TrumanLing/machine,thaJeztah/docker.github.io,tpires/machine,OpenNebula/machine,ekristen/machine,ppadala/machine,otherjason/machine,Grynn/machine,kunalkushwaha/machine,jhoos/machine,xinxian0458/machine,jsirois/machine,docker-zh/docker.github.io,londoncalling/machine,marsmensch/machine,atsaki/machine-2,ibuildthecloud/machine,titanlien/machine,denverdino/denverdino.github.io,docker-zh/docker.github.io,davidstosik/machine,13W/machine,anweiss/docker.github.io,robinbb/machine,jmelis/machine,juliengarcia/machine,ubiquityhosting/machine,BSWANG/denverdino.github.io,kechol/machine,errordeveloper/machine,LuisBosquez/docker.github.io,bdwill/docker.github.io,databus23/machine,schatt/machine,amylindburg/machine,beni55/machine,clintonskitson/machine,cpuguy83/machine,rillig/docker.github.io,zchee/machine,aduermael/docker.github.io,jzwlqx/denverdino.github.io,paultag/machine,jkingyens/machine,pottava/machine,titanlien/machine,Qwinix/docker-machine-vmware,steeve/machine,alexisbellido/docker.github.io,shubheksha/docker.github.io,cab105/machine,bwahn/machine,StackPointCloud/machine,alexisbellido/docker.github.io,bdwill/docker.github.io,OpenNebula/machine,steeve/machine,kunalkushwaha/machine,dweomer/docker-machine,carolynvs/machine,yanzay/machine,yut148/machine,erikdejonge/machine,dnephin/machine,dskora/machine,wlan0/machine,xiaohui/machine,denverdino/docker.github.io,yut148/machine,mjtrefethen/machine,zehicle/machine,aduermael/docker.github.io,pottava/machine,jeffellin/machine,denverdino/machine,denverdino/docker.github.io,cgvarela/machine,ggiamarchi/machine,kacole2/machine,moxiegirl/machine,denverdino/denverdino.github.io,menglingwei/denverdino.github.io,blueyed/machine,johnstep/docker.github.io,docker-zh/docker.github.io,docker-zh/docker.github.io,emsi/machine,jarosser06/machine,menglingwei/machine,moxiegirl/machine,djfarrelly/machine,trecloux/machine,erikdejonge/machine,bdwill/docker.github.io,beni55/machine,ibuildthecloud/machine,menglingwei/machine,binario200/machine,davidstosik/machine,londoncalling/docker.github.io,jzwlqx/denverdino.github.io,sanscontext/docker.github.io,shin-/docker.github.io,marsmensch/machine,JohnKDay/machine,usmanismail/machine,jasisk/machine,rowancarr/machine,tpires/machine,sjfloat/machine,johnstep/docker.github.io,docker/docker.github.io,hypriot/machine,cvstebut/machine,xinxian0458/machine,nunofgs/docker-machine,13W/machine,londoncalling/docker.github.io,askb/machine,bookerzzz/machine,ravolt/docker-machine,gdevillele/docker.github.io,rawkode/machine,sausheong/machine,flavio/machine,larsla/machine,sebadiaz/machine,sanscontext/docker.github.io,jeffellin/machine,aduermael/docker.github.io,carloreggiani/machine,duglin/machine,OpenNebula/machine,phiroict/docker,rillig/docker.github.io,pdxjohnny/machine,j3tm0t0/machine,jlusiardi/machine,kechol/machine,NeilW/machine,docker/docker.github.io,CenturyLinkLabs/machine,hironobu-s/machine,sjfloat/machine,londoncalling/docker.github.io,wzymaster/machine,anshulr/machine,s7v7nislands/machine,euank/machine,unodba/machine,LuisBosquez/docker.github.io,jsirois/machine,alexisbellido/docker.github.io,troy0820/docker.github.io,wlan0/machine,denmat/machine,faijaz/docker-machine,rawkode/machine,dgageot/machine,allingeek/machine,jzwlqx/denverdino.github.io,joeuo/docker.github.io,jgsqware/machine,joaofnfernandes/docker.github.io,soleo/machine,asalhamed/machine,denverdino/machine-1,anweiss/docker.github.io,atsaki/machine,errordeveloper/machine,imikushin/machine,jeffellin/machine,gerred/machine,jzwlqx/denverdino.github.io,robvanmieghem/machine,aperepel/machine,anweiss/docker.github.io,robvanmieghem/machine,bookerzzz/machine,asalhamed/machine,Kast0rTr0y/docker-machine,blueyed/machine,ddaze/machine,jarosser06/machine,joeuo/docker.github.io,pottava/machine,denverdino/machine,rwilliams/machine,mark-adams/machine,akolpakov/machine,frapposelli/machine,brandoncc/machine,juliengarcia/machine,wenlock/machine,databus23/machine,rdgreis/machine,dmp42/machine,bfirsh/machine,LaynePeng/machine,wenlock/machine,troy0820/docker.github.io,j3tm0t0/machine,sebadiaz/machine,rwilliams/machine,chantra/machine,djfarrelly/machine,allingeek/machine,zchee/machine,denverdino/docker.github.io,beni55/machine,schatt/machine,xiaohui/machine,tpires/machine,mark-adams/machine,phiroict/docker,cab105/machine,joelea/machine,flavio/machine,clintonskitson/machine,jkingyens/machine,xiaohui/machine,denverdino/denverdino.github.io,slowteetoe/machine,abstractitptyltd/machine,atsaki/machine,askb/machine,sjfloat/machine,duglin/machine,phiroict/docker,joelea/machine,wzymaster/machine,docker-zh/docker.github.io,robinbb/machine,Grynn/machine,thaJeztah/docker.github.io,ehazlett/machine,wenlock/machine,xinxian0458/machine,cpuguy83/machine,seegno-forks/machine,jhoos/machine,phiroict/docker,binario200/machine,ehazlett/machine,bwahn/machine,s7v7nislands/machine,shin-/docker.github.io,titanlien/machine,csakoda/machine,slowteetoe/machine,hironobu-s/machine,cgvarela/machine,shubheksha/docker.github.io,dmp42/machine,slashk/machine,jeanlaurent/machine,rwilliams/machine,JohnKDay/machine,akolpakov/machine,thaJeztah/docker.github.io,zehicle/machine,BSWANG/denverdino.github.io,JimGalasyn/docker.github.io,tyrken/machine,danix800/docker.github.io,miqui/machine,anshulr/machine,databus23/machine,denverdino/machine-1,ppadala/machine,jlusiardi/machine,Kast0rTr0y/docker-machine,amylindburg/machine,ppadala/machine,Qwinix/docker-machine-vmware,shot/machine,gdevillele/docker.github.io,jgsqware/machine,surgeforward/machine,cjellick/machine,crunchywelch/machine,docker/machine,StackPointCloud/machine,crunchywelch/machine,deitch/machine,JimGalasyn/docker.github.io,jasisk/machine,paultag/machine,jlusiardi/machine,ocean/machine,troy0820/docker.github.io,trecloux/machine,joaofnfernandes/docker.github.io,ravolt/docker-machine,imikushin/machine,alindeman/machine,askb/machine,robertbreker/machine,LuisBosquez/docker.github.io,voutilad/machine,robvanmieghem/machine,nunofgs/docker-machine,jsirois/machine,rillig/docker.github.io,allingeek/machine,denverdino/denverdino.github.io,TrumanLing/machine,frapposelli/machine,gdevillele/docker.github.io,pdxjohnny/machine,JimGalasyn/docker.github.io,jpressnell/machine,skippbox/kmachine,JimGalasyn/docker.github.io,gdevillele/docker.github.io,NeilW/machine,ubiquityhosting/machine,shubheksha/docker.github.io,sanscontext/docker.github.io,Parallels/docker-machine,menglingwei/machine,ksasi/machine,legal90/machine,rowancarr/machine,wzymaster/machine,joaofnfernandes/docker.github.io,mjhea0/machine,vovimayhem/machine,dnephin/machine,cab105/machine,otherjason/machine,mjhea0/machine,legal90/machine,ekristen/machine,alexisbellido/docker.github.io,londoncalling/machine,sanscontext/docker.github.io,denverdino/denverdino.github.io,ksasi/machine,gdevillele/docker.github.io,otherjason/machine,NeilW/machine,cvstebut/machine,cjellick/machine,danix800/docker.github.io,usmanismail/machine,alexisbellido/docker.github.io,kacole2/machine,bfirsh/machine,Herbis/machine,ggiamarchi/machine,evq/machine,JimGalasyn/docker.github.io,ddaze/machine,soleo/machine,jmelis/machine,skatsuta/machine,dudymas/machine,shin-/docker.github.io,MHBauer/machine,docker/machine,jeanlaurent/machine,menglingwei/denverdino.github.io,hironobu-s/machine,LuisBosquez/docker.github.io,chantra/machine,faijaz/docker-machine,sebadiaz/machine,ocean/machine,joyent/machine,whilp/machine,thaJeztah/machine,atsaki/machine-2,unodba/machine,dskora/machine,denverdino/docker.github.io,londoncalling/docker.github.io,thaJeztah/machine,whilp/machine,pragkent/machine,ksasi/machine,csakoda/machine,skippbox/kmachine,brandoncc/machine