Hack to get around Rails 4 and Devise 3.0.0.rc issue

I dont know if you are looking for feedback on Rails 4, but upgrading to Devise 3.0.0.rc breaks the registration process.  It has to do with how Devise changed the build_resource method to support strong parameters.  This line no longer returns the visitors email address.  
https://github.com/RailsApps/rails-prelaunch-signup/blob/master/app/controllers/registrations_controller.rb#L5
The change in Devise here https://github.com/plataformatec/devise/blob/master/app/controllers/devise/registrations_controller.rb#L85 is the culprit.  
I made a hack to get around it and it may not be best way to fix it, but I thought I'd share it anyway.