Merge branch '5.0' into 5.1

* 5.0:
  [HttpClient] Support for cURL handler objects.
  [HttpClient] unset activity list when creating CurlResponse
  Fixed typo in test name
  add .body wrapper element
  [HttpFondation] Change file extension of "audio/mpeg" from "mpga" to "mp3"
  [VarDumper] Support for cURL handler objects.
  Check whether path is file in DataPart::fromPath()
  [DI][FrameworkBundle] Remove whitelist occurrences
  Avoid accessibility errors on debug toolbar
  update cookie test

Tests/CookieTest.php

@@ -47,6 +47,7 @@ public function getTestsForToFromString()
         return [
             ['foo=bar; path=/'],
             ['foo=bar; path=/foo'],
+            ['foo="Test"; path=/'],
             ['foo=bar; domain=example.com; path=/'],
             ['foo=bar; domain=example.com; path=/; secure', 'https://example.com/'],
             ['foo=bar; path=/; httponly'],