fix(contrib): remove unnecessary call to echo
fix(contrib): read proper argument
docs(*): explicitly specify --hosts parameter for clusters:create

It's convenient to use `local.deisapp.com`, but since we're also
using that as the cluster domain, it's quite confusing.
Merge pull request #1479 from deis/clarify_clusters_create_hosts

docs(*): explicitly specify --hosts parameter for clusters:create
Merge pull request #1474 from deis/fixup-do-script

fix(contrib): digitalocean script arg parsing