Travis: no sudo, install nginx and openssl.
Travis: no sudo, install nginx and openssl.

brentdax/letsencrypt,tyagi-prashant/letsencrypt,stweil/letsencrypt,lmcro/letsencrypt,jtl999/certbot,twstrike/le_for_patching,ghyde/letsencrypt,DavidGarciaCat/letsencrypt,goofwear/letsencrypt,bsmr-misc-forks/letsencrypt,letsencrypt/letsencrypt,kevinlondon/letsencrypt,Bachmann1234/letsencrypt,brentdax/letsencrypt,wteiken/letsencrypt,rutsky/letsencrypt,skynet/letsencrypt,mrb/letsencrypt,beermix/letsencrypt,rlustin/letsencrypt,mitnk/letsencrypt,rlustin/letsencrypt,luorenjin/letsencrypt,riseofthetigers/letsencrypt,luorenjin/letsencrypt,piru/letsencrypt,TheBoegl/letsencrypt,martindale/letsencrypt,lmcro/letsencrypt,jsha/letsencrypt,kevinlondon/letsencrypt,goofwear/letsencrypt,jtl999/certbot,wteiken/letsencrypt,Hasimir/letsencrypt,thanatos/lets-encrypt-preview,BillKeenan/lets-encrypt-preview,Bachmann1234/letsencrypt,xgin/letsencrypt,Jadaw1n/letsencrypt,VladimirTyrin/letsencrypt,fmarier/letsencrypt,TheBoegl/letsencrypt,letsencrypt/letsencrypt,deserted/letsencrypt,xgin/letsencrypt,bestwpw/letsencrypt,hsduk/lets-encrypt-preview,Hasimir/letsencrypt,jsha/letsencrypt,g1franc/lets-encrypt-preview,bestwpw/letsencrypt,mrb/letsencrypt,kuba/letsencrypt,thanatos/lets-encrypt-preview,dietsche/letsencrypt,mitnk/letsencrypt,martindale/letsencrypt,deserted/letsencrypt,fmarier/letsencrypt,BillKeenan/lets-encrypt-preview,Jadaw1n/letsencrypt,stweil/letsencrypt,BKreisel/letsencrypt,sjerdo/letsencrypt,bsmr-misc-forks/letsencrypt,dietsche/letsencrypt,armersong/letsencrypt,BKreisel/letsencrypt,beermix/letsencrypt,skynet/letsencrypt,armersong/letsencrypt,tyagi-prashant/letsencrypt,hsduk/lets-encrypt-preview,DavidGarciaCat/letsencrypt,g1franc/lets-encrypt-preview,Sveder/letsencrypt,lbeltrame/letsencrypt,VladimirTyrin/letsencrypt,Sveder/letsencrypt,twstrike/le_for_patching,ghyde/letsencrypt,rutsky/letsencrypt,lbeltrame/letsencrypt,riseofthetigers/letsencrypt,kuba/letsencrypt,piru/letsencrypt,sjerdo/letsencrypt