Update changes.
Added referral behavior and a thanks page.
Added a basic mailer.
Add actionmailer configuration options.  Fix the cookies so that they automatically redirect users to the #thanks page.  Update the about page a bit.
Drafted a referral email.  Added an early_adopter column to :signups and drafted a rake task to set that value and generate referral codes for existing users.
Fixed the legal stuff.  Changed the about page.
Make a few aesthetic and writing tweaks.