Excluir urls del middleware de csrf en laravel 5.1

namespace App\Http\Middleware;
use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken as BaseVerifier;

class VerifyCsrfToken extends BaseVerifier
{
    /**
    * The URIs that should be excluded from CSRF verification.
    *
    * @var array
    */
    protected $except = [
      ‘route/to/exclude’
    ];
}

Fuente: Exclude routes on token verification in Laravel 5 - Pete Houston - Medium