Missing error handling if box name is already taken

[tiff]

Our boxname.protonet.info logic doesn't do error handling when a name is already taken. This is the reason why some boxes are not available on the internet but available through bonjour in the local network.

docker logs ptw shows:

Aug 26 22:29:20 skylabs systemd-docker[25207]: 2015/08/26 22:29:20 Moving pid 25229 to /sys/fs/cgroup/systemd/system.slice/ptw-protonet.service/cgroup.procs
Aug 26 22:29:20 skylabs systemd[1]: ptw-protonet.service: Supervising process 25229 which is not our child. We'll most likely not notice when it exits.
Aug 26 22:29:20 skylabs systemd[1]: Started Run 'ptw' service.
Aug 26 22:29:20 skylabs systemd-docker[25207]: platform.8c7c5bf1292e.ensure_identifier_exists: 0
Aug 26 22:29:20 skylabs systemd-docker[25207]: platform.8c7c5bf1292e.PublishToWeb.info: 0
Aug 26 22:29:21 skylabs systemd-docker[25207]: /usr/local/bundle/gems/publish_to_web-1.1.0/lib/publish_to_web.rb:42:in `call': ["invalid node name"] (ArgumentError)
Aug 26 22:29:21 skylabs systemd-docker[25207]: from /usr/local/bundle/gems/publish_to_web-1.1.0/lib/publish_to_web.rb:179:in `set_node_name'
Aug 26 22:29:21 skylabs systemd-docker[25207]: from /bin/start_publish_to_web:67:in `<main>'
Aug 26 22:29:31 skylabs systemd[1]: ptw-protonet.service: Service hold-off time over, scheduling restart.