Fixed #248 -- exposed `deis layers:update` in CLI.
Fixed #242 -- update "no proxy" error message.
Merge pull request #253 from opdemand/248-layers-update

Fixed #248 -- exposed `deis layers:update` in CLI.
Fixed TypeError in formations:create.
add digital ocean provider
Merge branch '73-digitalocean-provider' of github.com:bacongobbler/deis into 73-digitalocean-provider