notify staff of new confirmed users

Sends the email to a list to provide us the first go at notifications of sign ups.
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.  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.  Basically, we want all environments other than production to go to tech.  Written the way it is now, will start spamming the real distribution list in dev or in any future environment we add.