Cachet/app/Providers/AppServiceProvider.php

<?php

/*
 * This file is part of Cachet.
 *
 * (c) Cachet HQ <support@cachethq.io>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace CachetHQ\Cachet\Providers;

use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Boot the service provider.
     *
     * @param \Illuminate\Bus\Dispatcher $dispatcher
     *
     * @return void
     */
    public function boot(Dispatcher $dispatcher)
    {
        $dispatcher->mapUsing(function ($command) {
            return Dispatcher::simpleMapping($command, 'CachetHQ\Cachet\Commands', 'CachetHQ\Cachet\Handlers\Commands');
        });
    }

    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bind('Illuminate\Contracts\Auth\Registrar', 'CachetHQ\Cachet\Services\Registrar');
    }
}