Merge branch '2.4' into 2.5

* 2.4:
  Fixed return value
  Handle "constraints" option in form unit testing
  Added the fixes suggested by Ryan
  Reworded a bit the installation instructions
  Removed the sidebar and made some minor tweaks
  Minor fixes and tweaks
  More tweaks and fixes
  Removed the first person perspective and other minor fixes
  Fixed some code formatting
  More improvements based on reviewers' comments
  Fixed minor typo
  Applied all the fixes and suggestions made by reviewers
  First draft of the bundle installation instructions
  Update override_dir_structure.rst
  Cache needs be cleared

cookbook/bundles/best_practices.rst

@@ -194,6 +194,59 @@ Extensive documentation should also be provided in the
 the ``Resources/doc/`` directory; the ``Resources/doc/index.rst`` file is
 the only mandatory file and must be the entry point for the documentation.
 
+Installation Instructions
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+In order to ease the installation of third-party bundles, consider using the
+following standardized instructions in your ``README.md`` file.
+
+.. code-block:: text
+
+    Installation
+    ============
+
+    Step 1: Download the Bundle
+    ---------------------------
+
+    Open a command console, enter your project directory and execute the
+    following command to download the latest stable version of this bundle:
+
+    ```bash
+    $ composer require <package-name> "~1"
+    ```
+
+    This command requires you to have Composer installed globally, as explained
+    in the [installation chapter](https://getcomposer.org/doc/00-intro.md)
+    of the Composer documentation.
+
+    Step 2: Enable the Bundle
+    -------------------------
+
+    Then, enable the bundle by adding the following line in the `app/AppKernel.php`
+    file of your project:
+
+    ```php
+    <?php
+    // app/AppKernel.php
+
+    // ...
+
+    public function registerBundles()
+    {
+        $bundles = array(
+            // ...
+            return new <vendor>\<bundle-name>\<bundle-long-name>(),
+        );
+    }
+    ```
+
+This template assumes that your bundle is in its ``1.x`` version. If not, change
+the ``"~1"`` installation version accordingly (``"~2"``, ``"~3"``, etc.)
+
+Optionally, you can add more installation steps (*Step 3*, *Step 4*, etc.) to
+explain other required installation tasks, such as registering routes or
+dumping assets.
+
 Routing
 -------
 

cookbook/configuration/override_dir_structure.rst

@@ -147,9 +147,10 @@ file:
                 'read_from' => '%kernel.root_dir%/../../public_html',
             ));
 
-    Now you just need to dump the assets again and your application should
+    Now you just need to clear the cache and dump the assets again and your application should
     work:
 
     .. code-block:: bash
-
+    
+        $ php app/console cache:clear --env=prod
         $ php app/console assetic:dump --env=prod --no-debug

cookbook/form/unit_testing.rst

@@ -177,18 +177,22 @@ on other extensions. You need add those extensions to the factory object::
     use Symfony\Component\Form\Forms;
     use Symfony\Component\Form\FormBuilder;
     use Symfony\Component\Form\Extension\Validator\Type\FormTypeValidatorExtension;
+    use Symfony\Component\Validator\ConstraintViolationList;
 
     class TestedTypeTest extends TypeTestCase
     {
         protected function setUp()
         {
             parent::setUp();
+            
+            $validator = $this->getMock('\Symfony\Component\Validator\ValidatorInterface');
+            $validator->method('validate')->will($this->returnValue(new ConstraintViolationList()));
 
             $this->factory = Forms::createFormFactoryBuilder()
                 ->addExtensions($this->getExtensions())
                 ->addTypeExtension(
                     new FormTypeValidatorExtension(
-                        $this->getMock('Symfony\Component\Validator\ValidatorInterface')
+                        $validator
                     )
                 )
                 ->addTypeGuesser(