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

@@ -1,26 +1,13 @@
 Form Component
 ==============
 
-Form provides tools for defining forms, rendering and mapping request data to
-related models. Furthermore it provides integration with the Validation
-component.
+The Form component allows you to easily create, process and reuse HTML forms.
 
 Resources
 ---------
 
-Silex integration:
-
-https://github.com/silexphp/Silex/blob/master/src/Silex/Provider/FormServiceProvider.php
-
-Documentation:
-
-https://symfony.com/doc/2.7/book/forms.html
-
-Resources
----------
-
-You can run the unit tests with the following command:
-
-    $ cd path/to/Symfony/Component/Form/
-    $ composer install
-    $ phpunit
+  * [Documentation](https://symfony.com/doc/current/components/form/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)