Merge branch '2.8' into 3.0

* 2.8:
  prefer phpunit 5.x on hhvm
  Reflected the change of the choice_value option in the Upgrade information
  [FrameworkBundle][HttpKernel] the finder is required to discover bundle commands
  [travis] Auto-conf deps=high matrix line
  fix error level for deprecation
  Fix the logout path when not using the router
  Fix the logout path when not using the router
  [Form] cast IDs to match deprecated behaviour of EntityChoiceList
  [FrameworkBundle] minor: fix property_info service name in composer.json
  [HttpFoundation] Added the ability of mapping stream wrapper protocols when using X-Sendfile
  [HttpFoundation] Add a test case for using BinaryFileResponse with stream wrappers
  CSS min-height and min-width should not be "auto"

Conflicts:
	.travis.yml
	UPGRADE-2.8.md
	appveyor.yml
	src/Symfony/Bundle/FrameworkBundle/composer.json
	src/Symfony/Component/HttpFoundation/ParameterBag.php

Author: nicolas-grekas

Logout/LogoutUrlGenerator.php

@@ -113,7 +113,7 @@ private function generateLogoutUrl($key, $referenceType)
 
             $request = $this->requestStack->getCurrentRequest();
 
-            $url = UrlGeneratorInterface::ABSOLUTE_URL === $referenceType ? $request->getUriForPath($logoutPath) : $request->getBasePath().$logoutPath;
+            $url = UrlGeneratorInterface::ABSOLUTE_URL === $referenceType ? $request->getUriForPath($logoutPath) : $request->getBaseUrl().$logoutPath;
 
             if (!empty($parameters)) {
                 $url .= '?'.http_build_query($parameters);