Fix engine publish (#50) if directory exists
Fix engine publish (#50) if directory exists

MkdirAll will exit clean if the to-be-created directory exists

pagodabox/nanobox-cli,nanobox-io/nanobox,nanobox-io/nanobox-cli,nanobox-io/nanobox,nanobox-io/nanobox-cli,pagodabox/nanobox-cli,nanobox-io/nanobox-cli