minor #787 Updated the Kernel.php code to the latest Symfony recipe (javiereguiluz)

This PR was squashed before being merged into the master branch (closes #787).

Discussion
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Updated the Kernel.php code to the latest Symfony recipe

Updated src/Kernel.php according to the most recent version of https://github.com/symfony/recipes/blob/master/symfony/framework-bundle/3.3/src/Kernel.php

Commits
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ddde8ef Updated the Kernel.php code to the latest Symfony recipe

Author: javiereguiluz

src/Kernel.php

@@ -13,6 +13,7 @@
 
 use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
 use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\Kernel as BaseKernel;
 use Symfony\Component\Routing\RouteCollectionBuilder;
@@ -45,25 +46,22 @@ public function registerBundles()
 
     protected function configureContainer(ContainerBuilder $container, LoaderInterface $loader)
     {
+        $container->addResource(new FileResource($this->getProjectDir().'/config/bundles.php'));
         $container->setParameter('container.dumper.inline_class_loader', true);
         $confDir = $this->getProjectDir().'/config';
-        $loader->load($confDir.'/packages/*'.self::CONFIG_EXTS, 'glob');
-        if (is_dir($confDir.'/packages/'.$this->environment)) {
-            $loader->load($confDir.'/packages/'.$this->environment.'/**/*'.self::CONFIG_EXTS, 'glob');
-        }
-        $loader->load($confDir.'/services'.self::CONFIG_EXTS, 'glob');
-        $loader->load($confDir.'/services_'.$this->environment.self::CONFIG_EXTS, 'glob');
+
+        $loader->load($confDir.'/{packages}/*'.self::CONFIG_EXTS, 'glob');
+        $loader->load($confDir.'/{packages}/'.$this->environment.'/**/*'.self::CONFIG_EXTS, 'glob');
+        $loader->load($confDir.'/{services}'.self::CONFIG_EXTS, 'glob');
+        $loader->load($confDir.'/{services}_'.$this->environment.self::CONFIG_EXTS, 'glob');
     }
 
     protected function configureRoutes(RouteCollectionBuilder $routes)
     {
         $confDir = $this->getProjectDir().'/config';
-        if (is_dir($confDir.'/routes/')) {
-            $routes->import($confDir.'/routes/*'.self::CONFIG_EXTS, '/', 'glob');
-        }
-        if (is_dir($confDir.'/routes/'.$this->environment)) {
-            $routes->import($confDir.'/routes/'.$this->environment.'/**/*'.self::CONFIG_EXTS, '/', 'glob');
-        }
-        $routes->import($confDir.'/routes'.self::CONFIG_EXTS, '/', 'glob');
+
+        $routes->import($confDir.'/{routes}/*'.self::CONFIG_EXTS, '/', 'glob');
+        $routes->import($confDir.'/{routes}/'.$this->environment.'/**/*'.self::CONFIG_EXTS, '/', 'glob');
+        $routes->import($confDir.'/{routes}'.self::CONFIG_EXTS, '/', 'glob');
     }
 }