One of the maintainers of Tower here. The best way to get help is through Github issues. That's where we're active.
Yes, that command is currently not working. The bundler is also not complete, thus why it was commented out. Right now, we were concentrating mostly on the client-side of things. Right now, there's no use for scaffolding, but we'll be getting the server-side up to standards.
If you need any help, please visit our Github repositories, we'll be glad to help. FYI, the IRC channel is useless right now, we're never on it.