Merge branch '3.2'

* 3.2:
  [TwigBundle] fixed usage when Templating is not installed
  [Validator] Check cascasdedGroups for being countable
  [Cache] Add changelog for 3.2
  [Cache] Add changelog
  [Filesystem] Check that the directory is writable after created it in dumpFile()
  [HttpFoundation] Improved set cookie header tests
  [Serializer] int is valid when float is expected when deserializing JSON
  [Console] increased code coverage of Output classes
  Added missing headers in fixture files
  [Profiler][VarDumper] Fix minor color issue & duplicated selector

Author: fabpot

Tests/ResponseHeaderBagTest.php

@@ -331,7 +331,7 @@ public function provideMakeDispositionFail()
         );
     }
 
-    protected function assertSetCookieHeader($expected, ResponseHeaderBag $actual)
+    private function assertSetCookieHeader($expected, ResponseHeaderBag $actual)
     {
         $this->assertRegExp('#^Set-Cookie:\s+'.preg_quote($expected, '#').'$#m', str_replace("\r\n", "\n", (string) $actual));
     }