notify staff of new confirmed users

Sends the email to a list to provide us the first go at notifications of sign ups.
On Fri, Jul 25, 2014 at 07:51:58AM -0700, Brian Sadler wrote:
> Two things, I was thinking that you would add a new value in the config/environments/<env>.rb files, like config.user.signup.notification.email and then just use that variable here.

That was my first thought too, but there's no separate staging.rb in there so I wasn't sure that would work.

> I'm fine with you doing it this way, but I would switch it around and check if you're in production, set the address to signup-notification in that case, else set it to tech.

k. Though note that dev doesn't actually send to this anyway since all email from the dev environment is overridden automatically to hit the developer.