feature #728 Added a new AppBundle to comply with Symfony Best Practices (javiereguiluz)

This PR was squashed before being merged into the 3.0-dev branch (closes #728).

Discussion
----------

Added a new AppBundle to comply with Symfony Best Practices

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #671
| License       | MIT
| Doc PR        | -

Symfony Best Practices recommend to start developing your applications with a single AppBundle bundle. This PR allows to include that AppBundle in the Symfony Standard Edition, to make it easier for developers.

I used the same skeleton as for the `generate:bundle` command, but I thought that it would be better to simplify it and remove the `$name` route parameter and use just a static template without parameters.

Commits
-------

45da0d0 Added a new AppBundle to comply with Symfony Best Practices

Author: fabpot

app/AppKernel.php

@@ -16,6 +16,7 @@ public function registerBundles()
             new Symfony\Bundle\AsseticBundle\AsseticBundle(),
             new Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),
             new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),
+            new AppBundle\AppBundle(),
         );
 
         if (in_array($this->getEnvironment(), array('dev', 'test'))) {

app/Resources/views/default/index.html.twig

@@ -0,0 +1,5 @@
+{% extends 'base.html.twig' %}
+
+{% block body %}
+    Homepage.
+{% endblock %}

app/config/routing.yml

@@ -0,0 +1,3 @@
+app:
+    resource: @AppBundle/Controller/
+    type:     annotation

src/AppBundle/AppBundle.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace AppBundle;
+
+use Symfony\Component\HttpKernel\Bundle\Bundle;
+
+class AppBundle extends Bundle
+{
+}

src/AppBundle/Controller/DefaultController.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace AppBundle\Controller;
+
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
+use Symfony\Bundle\FrameworkBundle\Controller\Controller;
+
+class DefaultController extends Controller
+{
+    /**
+     * @Route("/", name="homepage")
+     */
+    public function indexAction()
+    {
+        return $this->render('default/index.html.twig');
+    }
+}

src/AppBundle/Tests/Controller/DefaultControllerTest.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace AppBundle\Tests\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+
+class DefaultControllerTest extends WebTestCase
+{
+    public function testIndex()
+    {
+        $client = static::createClient();
+
+        $crawler = $client->request('GET', '/');
+
+        $this->assertTrue($crawler->filter('html:contains("Homepage")')->count() > 0);
+    }
+}