Merge branch '2.3' into 2.7

* 2.3:
  Updated all the README files
  [TwigBundle] Fix failing test on appveyor
  [FrameworkBundle] Fix a regression in handling absolute and namespaced template paths
  Allow to normalize \Traversable
  Remove _path from query parameters when fragment is a subrequest and request attributes are already set Added tests for _path removal in FragmentListener
  Simplified everything
  Added a test
  Fixed the problem in an easier way
  Fixed a syntax issue
  Improved the error message when a template is not found
  [CodingStandards] Conformed to coding standards
  [TwigBundle] fixed Include file locations in "Template could not be found" exception

Author: fabpot

README.md

@@ -1,80 +1,14 @@
 DependencyInjection Component
 =============================
 
-DependencyInjection manages your services via a robust and flexible Dependency
-Injection Container.
-
-Here is a simple example that shows how to register services and parameters:
-
-```php
-use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Reference;
-
-$sc = new ContainerBuilder();
-$sc
-    ->register('foo', '%foo.class%')
-    ->addArgument(new Reference('bar'))
-;
-$sc->setParameter('foo.class', 'Foo');
-
-$sc->get('foo');
-```
-
-Method Calls (Setter Injection):
-
-```php
-$sc = new ContainerBuilder();
-
-$sc
-    ->register('bar', '%bar.class%')
-    ->addMethodCall('setFoo', array(new Reference('foo')))
-;
-$sc->setParameter('bar.class', 'Bar');
-
-$sc->get('bar');
-```
-
-Factory Class:
-
-If your service is retrieved by calling a static method:
-
-```php
-$sc = new ContainerBuilder();
-
-$sc
-    ->register('bar', '%bar.class%')
-    ->setFactory(array('%bar.class%', 'getInstance'))
-    ->addArgument('Aarrg!!!')
-;
-$sc->setParameter('bar.class', 'Bar');
-
-$sc->get('bar');
-```
-
-File Include:
-
-For some services, especially those that are difficult or impossible to
-autoload, you may need the container to include a file before
-instantiating your class.
-
-```php
-$sc = new ContainerBuilder();
-
-$sc
-    ->register('bar', '%bar.class%')
-    ->setFile('/path/to/file')
-    ->addArgument('Aarrg!!!')
-;
-$sc->setParameter('bar.class', 'Bar');
-
-$sc->get('bar');
-```
+The DependencyInjection component allows you to standardize and centralize the
+way objects are constructed in your application.
 
 Resources
 ---------
 
-You can run the unit tests with the following command:
-
-    $ cd path/to/Symfony/Component/DependencyInjection/
-    $ composer install
-    $ phpunit
+  * [Documentation](https://symfony.com/doc/current/components/dependency_injection/index.html)
+  * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+  * [Report issues](https://github.com/symfony/symfony/issues) and
+    [send Pull Requests](https://github.com/symfony/symfony/pulls)
+    in the [main Symfony repository](https://github.com/symfony/symfony)