use meta charset in layouts without legacy http-equiv
enforce memcached version to be 2.1.0

The signature of the `Memcached::get()` method changed with 2.2.0.
Therefore, tests fail in Symfony when mocking `Memcached` in the
`MemcachedSessionHandlerTest` of the HttpFoundation component (see
also php-memcached-dev/php-memcached#126 and
https://bugs.php.net/bug.php?id=66331).
Merge branch '2.3' into 2.5

* 2.3:
  enforce memcached version to be 2.1.0
  [FrameworkBundle] improve server:run feedback
  [Form] no need to add the url listener when it does not do anything
  [Form] Fix #11694 - Enforce options value type check in some form types
  Lithuanian security translations
  [Router] Cleanup
  [FrameworkBundle] Fixed ide links
  Add missing argument
  [TwigBundle] do not pass a template reference to twig
  [TwigBundle] show correct fallback exception template in debug mode
  [TwigBundle] remove unused email placeholder from error page
  use meta charset in layouts without legacy http-equiv

Conflicts:
	src/Symfony/Bundle/TwigBundle/Loader/FilesystemLoader.php
	src/Symfony/Bundle/TwigBundle/Resources/views/layout.html.twig