Merge branch '2.3' into 2.7

* 2.3:
  Windows and Intl fixes
  Add appveyor.yml for C.I. on Windows
  [travis] merge php: nightly and deps=high test-matrix lines
  [Security] Add missing docblock in PreAuthenticatedToken

Conflicts:
	.travis.yml
	src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
	src/Symfony/Component/HttpFoundation/JsonResponse.php
	src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php

Author: nicolas-grekas

Extension/Core/Type/DateType.php

@@ -262,7 +262,7 @@ private function formatTimestamps(\IntlDateFormatter $formatter, $regex, array $
         $pattern = $formatter->getPattern();
         $timezone = $formatter->getTimezoneId();
 
-        if ($setTimeZone = method_exists($formatter, 'setTimeZone')) {
+        if ($setTimeZone = PHP_VERSION_ID >= 50500 || method_exists($formatter, 'setTimeZone')) {
             $formatter->setTimeZone('UTC');
         } else {
             $formatter->setTimeZoneId('UTC');