No warranties. This is very beta extension for implementing the drag and drop order function in bolt. you need a taxonomy "sortierung" and shouldn't have any other taxonomies, because it might not work

gistfile1.php

<?php
namespace Bolt\Extension\Largo\SortOrder;
use Symfony\Component\HttpFoundation\Response;

use Bolt;

class Extension extends \Bolt\BaseExtension
{
     /** @var boolean */
    private $isAdmin;

    public function getName() {
        return "SortOrder";
    }

    function info() {

        $data = array(
            'name' =>"Sort Order",
            'description' => "This extension reacts to the event when you reorder something in a content type.",
            'author' => "Largo",
            'link' => "http://bolt.cm",
            'version' => "1.0",
            'required_bolt_version' => "2.2",
            'highest_bolt_version' => "2.2",
            'type' => "",
            'first_releasedate' => "2015-06-04",
            'latest_releasedate' => "2015-06-04",
        );

        return $data;
    }

    // This checks if a user is a dashboard user
    public function isAdmin()
    {
        if (is_null($this->isAdmin)) {
            // check if user has allowed role(s)
            $user    = $this->app['users']->getCurrentUser();
            $userid  = $user['id'];
            $this->isAdmin = false;
            //foreach ($this->config['admin_roles'] as $role) {
               // if ($this->app['users']->hasRole($userid, 'chief-editor')) {
                if ($user) { //&& $user->isAllowed('login')
                    $this->isAdmin = true;
                  //  break;
                }
           // }
        }
        return $this->isAdmin;
    }

    function initialize() {
        $this->app->match("/bolt/overview/undefinedcontent/sortcontent/{contenttype}", array($this, 'saveorder'));
    }

    public function saveorder($contenttype) {
        if(!$this->isAdmin()) {
            echo "bye"; exit;
        }        

        $items = $this->app['request']->get('item');
        $body = "success";

        $content = $this->app['storage']->getContent(
                $contenttype,
                array('limit' => 10000, 'order' => 'datepublish desc', 'hydrate' => true)
        );

        foreach ($content as $entry) {
            $entry->sortorder = (int) array_search($entry->id, $items);
            $entry->group['order'] =  $entry->sortorder;
            $entry->setTaxonomy('sortierung', 'nicht_sortiert', 'nicht_sortiert', 0);
            $this->app['storage']->saveContent($entry);
            $entry->setTaxonomy('sortierung', 'sortierung', 'Beiträge', (int) array_search($entry->id, $items));
            $this->app['storage']->saveContent($entry);
        }
        foreach ($content as $entry) {
            $this->app['db']->executeQuery("UPDATE bolt_taxonomy SET sortorder = '". (int) array_search($entry->id, $items) ."' WHERE bolt_taxonomy.content_id = ". $entry->id .";");
        }
        $headers = array();
      
        return new Response($body, 200, $headers);
    }
}

My Taxonomy:

sortierung:
slug: sortierung
singular_slug: sortierung
behaves_like: grouping
prefix: "Hier wird die Sortierung gespeichert"
options: { sortierung: 'sortierung', nicht_sortiert : 'nicht sortiert' }
has_sortorder: true