Message to notify new volunteers of confirmation process

The following static message has been added to app/views/devise/registrations/new.html.erb:

"Please note that, after submitting this form, an administrator-user of the Robot must confirm you as a valid volunteer (specifically, in the region you've selected above) before you can start signing up for deliveries.

The exact procedure to follow for confirmation may vary from region to region; you may be required to undergo an orientation process to acquaint you with the Robot's workings. Inquire with your local Food Rescue organization for more information."

![confirm_message_ss](https://f.cloud.github.com/assets/5466633/1927843/105e879a-7e6b-11e3-913e-84bed356cc22.png)