fix delay impressionist for tags and pages

lib/tasks/migrate.rake

@@ -320,6 +320,9 @@ namespace :migrate do
         end
       end
     end
+
+  task :clear_news_tags => :environment do
+    `mongo #{Mongoid.config.database.name} --eval "db.tags.remove({_type: {$ne: 'Tag'}})"`
   end
 
 end