Merge branch '2.3' into 2.7

* 2.3:
  [travis] timeout the sigchild tests at 60s
  CS: Single line comments should use double slashes (//) and not hash (#).
  Do not use HttpKernel Extension when not needed
  bumped Symfony version to 2.3.37
  updated VERSION for 2.3.36
  update CONTRIBUTORS for 2.3.36
  updated CHANGELOG for 2.3.36
  use nowdoc instead of heredoc

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php
	src/Symfony/Bundle/FrameworkBundle/Command/RouterApacheDumperCommand.php
	src/Symfony/Bundle/FrameworkBundle/Command/RouterMatchCommand.php
	src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
	src/Symfony/Bundle/TwigBundle/Command/LintCommand.php
	src/Symfony/Component/Config/Tests/Definition/Dumper/YamlReferenceDumperTest.php
	src/Symfony/Component/Debug/ExceptionHandler.php
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/Routing/Generator/Dumper/PhpGeneratorDumper.php

Author: nicolas-grekas

Tests/Definition/Dumper/YamlReferenceDumperTest.php

@@ -28,7 +28,7 @@ public function testDumper()
 
     private function getConfigurationAsString()
     {
-        return <<<EOL
+        return <<<'EOL'
 acme_root:
     boolean:              true
     scalar_empty:         ~