Added "devise" for authentication.

config/environments/development.rb

@@ -16,6 +16,8 @@ Debshots::Application.configure do
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false
 
+  config.action_mailer.default_url_options = { :host => 'localhost:3000' }
+
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log