Bring back Vagrant documentation (fixes #309).
Bring back Vagrant documentation (fixes #309).

tdfischer/lets-encrypt-preview,jmhodges/letsencrypt,mitnk/letsencrypt,tyagi-prashant/letsencrypt,piru/letsencrypt,kevinlondon/letsencrypt,PeterMosmans/letsencrypt,stweil/letsencrypt,stewnorriss/letsencrypt,hsduk/lets-encrypt-preview,tyagi-prashant/letsencrypt,g1franc/lets-encrypt-preview,piru/letsencrypt,DavidGarciaCat/letsencrypt,skynet/letsencrypt,ruo91/letsencrypt,jtl999/certbot,jsha/letsencrypt,deserted/letsencrypt,BKreisel/letsencrypt,g1franc/lets-encrypt-preview,VladimirTyrin/letsencrypt,dietsche/letsencrypt,digideskio/lets-encrypt-preview,martindale/letsencrypt,vcavallo/letsencrypt,riseofthetigers/letsencrypt,jmaurice/letsencrypt,lbeltrame/letsencrypt,Hasimir/letsencrypt,VladimirTyrin/letsencrypt,DavidGarciaCat/letsencrypt,fmarier/letsencrypt,Hasimir/letsencrypt,luorenjin/letsencrypt,bsmr-misc-forks/letsencrypt,sapics/letsencrypt,bestwpw/letsencrypt,thanatos/lets-encrypt-preview,modulexcite/letsencrypt,Bachmann1234/letsencrypt,diracdeltas/lets-encrypt-preview,armersong/letsencrypt,stweil/letsencrypt,Bachmann1234/letsencrypt,ahojjati/letsencrypt,beermix/letsencrypt,TheBoegl/letsencrypt,Jonadabe/letsencrypt,wteiken/letsencrypt,brentdax/letsencrypt,skynet/letsencrypt,stewnorriss/letsencrypt,PeterMosmans/letsencrypt,bestwpw/letsencrypt,goofwear/letsencrypt,kuba/letsencrypt,solidgoldbomb/letsencrypt,ruo91/letsencrypt,modulexcite/letsencrypt,diracdeltas/lets-encrypt-preview,sjerdo/letsencrypt,hsduk/lets-encrypt-preview,brentdax/letsencrypt,solidgoldbomb/letsencrypt,goofwear/letsencrypt,Jadaw1n/letsencrypt,sapics/letsencrypt,armersong/letsencrypt,mitnk/letsencrypt,jmaurice/letsencrypt,Jadaw1n/letsencrypt,letsencrypt/letsencrypt,BKreisel/letsencrypt,BillKeenan/lets-encrypt-preview,jtl999/certbot,beermix/letsencrypt,twstrike/le_for_patching,hlieberman/letsencrypt,lbeltrame/letsencrypt,lmcro/letsencrypt,rlustin/letsencrypt,xgin/letsencrypt,rutsky/letsencrypt,rugk/letsencrypt,mrb/letsencrypt,deserted/letsencrypt,hlieberman/letsencrypt,vcavallo/letsencrypt,Sveder/letsencrypt,kevinlondon/letsencrypt,xgin/letsencrypt,thanatos/lets-encrypt-preview,digideskio/lets-encrypt-preview,martindale/letsencrypt,jmhodges/letsencrypt,tdfischer/lets-encrypt-preview,mrb/letsencrypt,rugk/letsencrypt,sjerdo/letsencrypt,jsha/letsencrypt,fmarier/letsencrypt,bsmr-misc-forks/letsencrypt,BillKeenan/lets-encrypt-preview,rutsky/letsencrypt,TheBoegl/letsencrypt,dietsche/letsencrypt,ghyde/letsencrypt,riseofthetigers/letsencrypt,ghyde/letsencrypt,rlustin/letsencrypt,wteiken/letsencrypt,luorenjin/letsencrypt,kuba/letsencrypt,ahojjati/letsencrypt,lmcro/letsencrypt,letsencrypt/letsencrypt,Jonadabe/letsencrypt,Sveder/letsencrypt,twstrike/le_for_patching