js__backbone__codeschool1/config/dev.php

<?php

use Silex\Provider\MonologServiceProvider;
use Silex\Provider\WebProfilerServiceProvider;

// include the prod configuration
require __DIR__ . '/prod.php';

// enable the debug mode
$app['debug'] = true;

$app->register(new MonologServiceProvider(), [
  'monolog.logfile' => __DIR__ . '/../var/logs/silex_dev.log',
]);

$app->register(new WebProfilerServiceProvider(), [
  'profiler.cache_dir' => __DIR__ . '/../var/cache/profiler',
]);