Merge branch '2.7' into 2.8

* 2.7:
  [HttpFoundation] Fix transient test
  [HttpFoundation] Add a dependency on the mbstring polyfill
  [2.7] update readme files for new components
  add readme files where missing
  fix lowest TwigBridge deps versions
  [EventDispatcher] fix syntax error
  Don't use reflections when possible
  Don't use reflections when possible
  [Form] Update form tests after the ICU data update
  [Intl] Update tests and the number formatter to match behaviour of the intl extension
  [Intl] Update the ICU data to version 55
  [Intl] Fix the update-data.php script in preparation for ICU 5.5
  [Process] Fix memory issue when using large input streams
  Use constant instead of function call.
  fixed test name
  automatically generate safe fallback filename
  [Console] default to stderr in the console helpers

Conflicts:
	composer.json
	src/Symfony/Bridge/PhpUnit/README.md
	src/Symfony/Bridge/Twig/composer.json
	src/Symfony/Component/Console/Helper/DialogHelper.php
	src/Symfony/Component/Debug/DebugClassLoader.php
	src/Symfony/Component/HttpFoundation/composer.json
	src/Symfony/Component/Security/Acl/README.md
	src/Symfony/Component/Security/Core/README.md
	src/Symfony/Component/Security/Csrf/README.md
	src/Symfony/Component/Security/Http/README.md

Author: nicolas-grekas

Container.php

@@ -375,9 +375,8 @@ public function reset()
     public function getServiceIds()
     {
         $ids = array();
-        $r = new \ReflectionClass($this);
-        foreach ($r->getMethods() as $method) {
-            if (preg_match('/^get(.+)Service$/', $method->name, $match)) {
+        foreach (get_class_methods($this) as $method) {
+            if (preg_match('/^get(.+)Service$/', $method, $match)) {
                 $ids[] = self::underscore($match[1]);
             }
         }