Travis: gimme 1.5 only for integration tests
Travis: gimme 1.5 only for integration tests

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