Wordpress plugin to use tags and category with custom post types

tag_category_cpt.php

<?php
/*
Plugin Name: Tags search
Description: Permet de rechercher par tag dans tous les post types
Version: 1.0
Author: Gabriel Majoulet
Author URI: http://www.gabriel-majoulet.fr
*/

if(!class_exists('Tag_Rewrite')) {
    class Tag_Rewrite
    {
        function __construct()
        {
            add_action( 'pre_get_posts', array(&$this, 'parseQuery') );
        }

        function parseQuery($query)
        {
            if (is_tag() || is_category()) {
                $post_type = array('post', 'news');
                $query->set('post_type', $post_type);
            }

            return $query;
        }
    }
}

if(class_exists('Tag_Rewrite')) {
    $tag_rewrite = new Tag_Rewrite();
}