Either expose mailing options or provide an alternate way to add new users

[strangecompany]

It's currently impossible to add new users to a Sandstorm Ghost instance, because in order to add a new user Ghost needs to send an email out, and there's no way to edit config.js to add mailer setup details.

The two obvious potential solutions would be:

• Modify the New User function so that it no longer requires an email to be sent out.
• Add a dialog for entering mailer details.

The latter might be slightly more useful as it'd also enable other mail functionality.

[jparyani]

We purposely don't support multiple users in the current version of the Ghost Sandstorm port. As soon as we update to the latest ghost, this will all be supported natively. Logging in with different Sandstorm accounts will map to different users in Ghost.