compile fos_js_routing_js callback into static js for use with assetic

fosJsRoutingDump

<?php

require_once __DIR__.'/../app/bootstrap.php.cache';
require_once __DIR__.'/../app/AppKernel.php';

use Symfony\Component\HttpFoundation\Request;

$kernel = new AppKernel('stage', false);
$kernel->loadClassCache();
$response = $kernel->handle(Request::create('/js/routing?callback=fos.Router.setData'));

file_put_contents(__DIR__.'/../web/js/routes.js', $response->getContent());