Add devise gem and panel/users controller

config/environments/development.rb

@@ -14,4 +14,6 @@ config.action_view.debug_rjs                         = true
 config.action_controller.perform_caching             = false
 
 # Don't care if the mailer can't send
-config.action_mailer.raise_delivery_errors = false
+config.action_mailer.raise_delivery_errors = false
+
+config.action_mailer.default_url_options = { :host => 'localhost:3000' }