disable some excessive logging in production

namely "Rendered ..." lines, which are quite numerous on pages with
lots of comments

config/environments/production.rb

@@ -76,3 +76,7 @@ Lobsters::Application.configure do
   # Do not dump schema after migrations.
   config.active_record.dump_schema_after_migration = false
 end
+
+%w{render_template render_partial render_collection}.each do |event|
+  ActiveSupport::Notifications.unsubscribe "#{event}.action_view"
+end