Merge branch '2.3' into 2.5

* 2.3:
  [SecurityBundle] Authentication entry point is only registered with firewall exception listener, not with authentication listeners
  be smarter when guessing the document root
  Azerbaijani locale
  Fixed grammar error in docblock
  Adjust upgrade file rendering
  [Bridge/Propel1] Changed deps to accepts all upcoming propel1 versions
  compare version using PHP_VERSION_ID
  [Form] Add doc for FormEvents
  don't override internal PHP constants

Conflicts:
	UPGRADE-3.0.md
	src/Symfony/Bundle/FrameworkBundle/Command/ServerRunCommand.php
	src/Symfony/Component/Debug/ErrorHandler.php
	src/Symfony/Component/HttpFoundation/Response.php

Descriptor/TextDescriptor.php

@@ -205,7 +205,7 @@ private function writeText($content, array $options = array())
      */
     private function formatDefaultValue($default)
     {
-        if (version_compare(PHP_VERSION, '5.4', '<')) {
+        if (PHP_VERSION_ID < 50400) {
             return str_replace('\/', '/', json_encode($default));
         }
 

Input/InputDefinition.php

@@ -11,11 +11,6 @@
 
 namespace Symfony\Component\Console\Input;
 
-if (!defined('JSON_UNESCAPED_UNICODE')) {
-    define('JSON_UNESCAPED_SLASHES', 64);
-    define('JSON_UNESCAPED_UNICODE', 256);
-}
-
 use Symfony\Component\Console\Descriptor\TextDescriptor;
 use Symfony\Component\Console\Descriptor\XmlDescriptor;
 use Symfony\Component\Console\Output\BufferedOutput;