only load rails admin in production mode

config/initializers/rails_admin.rb

@@ -1,6 +1,6 @@
 # RailsAdmin config file. Generated on March 24, 2012 15:34
 # See github.com/sferik/rails_admin for more informations
-
+unless Rails.env.production?
 RailsAdmin.config do |config|
    config.authorize_with do 
     redirect_to main_app.root_path unless current_user.try(:admin?)
@@ -1140,4 +1140,5 @@ if defined?(WillPaginate)
       alias_method :num_pages, :total_pages
     end
   end
+end
 end