Change message for virualbox_not_detected to accurately indicate which version of VirtualBox is required. [closes GH-458]
Change message for virualbox_not_detected to accurately indicate which version of VirtualBox is required. [closes GH-458]

mitchellh/vagrant,otagi/vagrant,ArloL/vagrant,johntron/vagrant,cgvarela/vagrant,doy/vagrant,signed8bit/vagrant,kamigerami/vagrant,senglin/vagrant,Endika/vagrant,bshurts/vagrant,darkn3rd/vagrant,lonniev/vagrant,theist/vagrant,tknerr/vagrant,mwarren/vagrant,Endika/vagrant,dhoer/vagrant,patrys/vagrant,p0deje/vagrant,fnewberg/vagrant,myrjola/vagrant,vamegh/vagrant,sferik/vagrant,msabramo/vagrant,bdwyertech/vagrant,mpoeter/vagrant,chrisroberts/vagrant,mkuzmin/vagrant,mephaust/vagrant,juiceinc/vagrant,genome21/vagrant,zsjohny/vagrant,sax/vagrant,BlakeMesdag/vagrant,clinstid/vagrant,TheBigBear/vagrant,carlosefr/vagrant,ianmiell/vagrant,jkburges/vagrant,tbarrongh/vagrant,muhanadra/vagrant,bshurts/vagrant,bdwyertech/vagrant,nickryand/vagrant,bshurts/vagrant,marxarelli/vagrant,BlakeMesdag/vagrant,Chhed13/vagrant,dhoer/vagrant,chrisroberts/vagrant,pwnall/vagrant,ArloL/vagrant,dharmab/vagrant,crashlytics/vagrant,crashlytics/vagrant,invernizzi-at-google/vagrant,PatOShea/vagrant,benh57/vagrant,Ninir/vagrant,aaam/vagrant,msabramo/vagrant,channui/vagrant,doy/vagrant,gpkfr/vagrant,gajdaw/vagrant,tomfanning/vagrant,krig/vagrant,webcoyote/vagrant,PatOShea/vagrant,theist/vagrant,carlosefr/vagrant,sideci-sample/sideci-sample-vagrant,Chhed13/vagrant,pwnall/vagrant,bmhatfield/vagrant,jkburges/vagrant,gitebra/vagrant,chrisvire/vagrant,dustymabe/vagrant,johntron/vagrant,ianmiell/vagrant,mwarren/vagrant,lukebakken/vagrant,mpoeter/vagrant,ArloL/vagrant,MiLk/vagrant,myrjola/vagrant,tbriggs-curse/vagrant,teotihuacanada/vagrant,otagi/vagrant,krig/vagrant,shtouff/vagrant,rivy/vagrant,pwnall/vagrant,juiceinc/vagrant,glensc/vagrant,msabramo/vagrant,bryson/vagrant,nickryand/vagrant,h4ck3rm1k3/vagrant,dustymabe/vagrant,tjanez/vagrant,Sgoettschkes/vagrant,TheBigBear/vagrant,dharmab/vagrant,wkolean/vagrant,Avira/vagrant,tschortsch/vagrant,tbarrongh/vagrant,stephancom/vagrant,crashlytics/vagrant,dharmab/vagrant,tjanez/vagrant,jhoblitt/vagrant,mephaust/vagrant,apertoso/vagrant,tknerr/vagrant,MiLk/vagrant,aaam/vagrant,jtopper/vagrant,bdwyertech/vagrant,rivy/vagrant,miguel250/vagrant,denisbr/vagrant,mwrock/vagrant,sax/vagrant,webcoyote/vagrant,bryson/vagrant,gitebra/vagrant,webcoyote/vagrant,Chhed13/vagrant,senglin/vagrant,johntron/vagrant,jfchevrette/vagrant,cgvarela/vagrant,mwarren/vagrant,darkn3rd/vagrant,patrys/vagrant,marxarelli/vagrant,wkolean/vagrant,dhoer/vagrant,iNecas/vagrant,jberends/vagrant,evverx/vagrant,jkburges/vagrant,jean/vagrant,senglin/vagrant,chrisroberts/vagrant,kamazee/vagrant,invernizzi-at-google/vagrant,kamazee/vagrant,channui/vagrant,zsjohny/vagrant,jberends/vagrant,myrjola/vagrant,darkn3rd/vagrant,shtouff/vagrant,genome21/vagrant,samphippen/vagrant,vamegh/vagrant,Chhed13/vagrant,benizi/vagrant,otagi/vagrant,mkuzmin/vagrant,jhoblitt/vagrant,sferik/vagrant,jkburges/vagrant,modulexcite/vagrant,h4ck3rm1k3/vagrant,tbarrongh/vagrant,Sgoettschkes/vagrant,chrisvire/vagrant,bheuvel/vagrant,benizi/vagrant,patrys/vagrant,PatrickLang/vagrant,PatrickLang/vagrant,jmanero/vagrant,juiceinc/vagrant,tknerr/vagrant,samphippen/vagrant,tschortsch/vagrant,gbarberi/vagrant,mephaust/vagrant,invernizzi-at-google/vagrant,krig/vagrant,darkn3rd/vagrant,channui/vagrant,jberends/vagrant,gitebra/vagrant,sni/vagrant,h4ck3rm1k3/vagrant,krig/vagrant,bdwyertech/vagrant,myrjola/vagrant,fnewberg/vagrant,ArloL/vagrant,jhoblitt/vagrant,dustymabe/vagrant,fnewberg/vagrant,h4ck3rm1k3/vagrant,petems/vagrant,signed8bit/vagrant,blueyed/vagrant,PatrickLang/vagrant,mwrock/vagrant,philwrenn/vagrant,cgvarela/vagrant,kalabiyau/vagrant,genome21/vagrant,zsjohny/vagrant,ferventcoder/vagrant,jmanero/vagrant,loren-osborn/vagrant,loren-osborn/vagrant,tomfanning/vagrant,wangfakang/vagrant,Avira/vagrant,wkolean/vagrant,MiLk/vagrant,signed8bit/vagrant,janek-warchol/vagrant,bryson/vagrant,miguel250/vagrant,TheBigBear/vagrant,petems/vagrant,kalabiyau/vagrant,teotihuacanada/vagrant,rivy/vagrant,mitchellh/vagrant,chrisvire/vagrant,wangfakang/vagrant,dharmab/vagrant,webcoyote/vagrant,kamigerami/vagrant,Avira/vagrant,mephaust/vagrant,msabramo/vagrant,tomfanning/vagrant,wangfakang/vagrant,ianmiell/vagrant,ferventcoder/vagrant,BlakeMesdag/vagrant,modulexcite/vagrant,tknerr/vagrant,miguel250/vagrant,sax/vagrant,glensc/vagrant,kamazee/vagrant,kamigerami/vagrant,miguel250/vagrant,muhanadra/vagrant,shtouff/vagrant,jean/vagrant,jtopper/vagrant,theist/vagrant,Ninir/vagrant,iNecas/vagrant,janek-warchol/vagrant,vamegh/vagrant,tschortsch/vagrant,blueyed/vagrant,jberends/vagrant,wangfakang/vagrant,gajdaw/vagrant,petems/vagrant,patrys/vagrant,aneeshusa/vagrant,sferik/vagrant,janek-warchol/vagrant,samphippen/vagrant,justincampbell/vagrant,jean/vagrant,Chhunlong/vagrant,mkuzmin/vagrant,philwrenn/vagrant,gpkfr/vagrant,marxarelli/vagrant,mwrock/vagrant,marxarelli/vagrant,philoserf/vagrant,modulexcite/vagrant,gbarberi/vagrant,taliesins/vagrant,evverx/vagrant,ferventcoder/vagrant,dustymabe/vagrant,jtopper/vagrant,senglin/vagrant,taliesins/vagrant,carlosefr/vagrant,samphippen/vagrant,bheuvel/vagrant,mwarren/vagrant,johntron/vagrant,rivy/vagrant,blueyed/vagrant,tbarrongh/vagrant,sni/vagrant,Chhunlong/vagrant,denisbr/vagrant,mitchellh/vagrant,gpkfr/vagrant,Sgoettschkes/vagrant,benh57/vagrant,otagi/vagrant,Sgoettschkes/vagrant,tbriggs-curse/vagrant,apertoso/vagrant,janek-warchol/vagrant,muhanadra/vagrant,gbarberi/vagrant,evverx/vagrant,jtopper/vagrant,PatrickLang/vagrant,mwrock/vagrant,shtouff/vagrant,taliesins/vagrant,carlosefr/vagrant,stephancom/vagrant,gajdaw/vagrant,lukebakken/vagrant,clinstid/vagrant,nickryand/vagrant,philoserf/vagrant,aneeshusa/vagrant,sideci-sample/sideci-sample-vagrant,ianmiell/vagrant,fnewberg/vagrant,bmhatfield/vagrant,lonniev/vagrant,lonniev/vagrant,justincampbell/vagrant,mitchellh/vagrant,justincampbell/vagrant,lukebakken/vagrant,philoserf/vagrant,jfchevrette/vagrant,kamigerami/vagrant,denisbr/vagrant,tbriggs-curse/vagrant,apertoso/vagrant,stephancom/vagrant,loren-osborn/vagrant,denisbr/vagrant,legal90/vagrant,kalabiyau/vagrant,jean/vagrant,gbarberi/vagrant,kalabiyau/vagrant,tjanez/vagrant,sideci-sample/sideci-sample-vagrant,jmanero/vagrant,tbriggs-curse/vagrant,gpkfr/vagrant,mpoeter/vagrant,benizi/vagrant,obnoxxx/vagrant,sni/vagrant,jfchevrette/vagrant,Avira/vagrant,invernizzi-at-google/vagrant,doy/vagrant,justincampbell/vagrant,p0deje/vagrant,apertoso/vagrant,sni/vagrant,bmhatfield/vagrant,Ninir/vagrant,aaam/vagrant,lukebakken/vagrant,nickryand/vagrant,benizi/vagrant,theist/vagrant,stephancom/vagrant,genome21/vagrant,teotihuacanada/vagrant,bheuvel/vagrant,philoserf/vagrant,bryson/vagrant,aneeshusa/vagrant,taliesins/vagrant,blueyed/vagrant,pwnall/vagrant,ferventcoder/vagrant,kamazee/vagrant,jfchevrette/vagrant,philwrenn/vagrant,signed8bit/vagrant,Endika/vagrant,Endika/vagrant,dhoer/vagrant,vamegh/vagrant,lonniev/vagrant,mkuzmin/vagrant,Chhunlong/vagrant,jhoblitt/vagrant,tjanez/vagrant,benh57/vagrant,tschortsch/vagrant,muhanadra/vagrant,juiceinc/vagrant,jmanero/vagrant,PatOShea/vagrant,doy/vagrant,chrisvire/vagrant,tomfanning/vagrant,TheBigBear/vagrant,PatOShea/vagrant,philwrenn/vagrant,gitebra/vagrant,crashlytics/vagrant,chrisroberts/vagrant,loren-osborn/vagrant,modulexcite/vagrant,obnoxxx/vagrant,bshurts/vagrant,legal90/vagrant,aaam/vagrant,wkolean/vagrant,aneeshusa/vagrant,cgvarela/vagrant,Chhunlong/vagrant,sax/vagrant,obnoxxx/vagrant,teotihuacanada/vagrant,petems/vagrant,legal90/vagrant,zsjohny/vagrant,iNecas/vagrant,benh57/vagrant,bheuvel/vagrant,mpoeter/vagrant,p0deje/vagrant,clinstid/vagrant,legal90/vagrant