Merge branch '2.3' into 2.4

* 2.3:
  bumped Symfony version to 2.3.18
  updated VERSION for 2.3.17
  update CONTRIBUTORS for 2.3.17
  updated CHANGELOG for 2.3.17
  added XSD to PHPUnit configuration
  bug #11319 [HttpKernel] Ensure the storage exists before purging it in ProfilerTest
  [Translation] Added unescaping of ids in PoFileLoader
  updated italian translation for validation messages
  [DomCrawler] Fix docblocks and formatting.
  [DomCrawler] Remove the query string and the anchor of the uri of a link
  Simplified the Travis test command
  [Console] Make sure formatter is the same

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php

Author: fabpot

Output/ConsoleOutput.php

@@ -50,7 +50,7 @@ public function __construct($verbosity = self::VERBOSITY_NORMAL, $decorated = nu
 
         parent::__construct(fopen($outputStream, 'w'), $verbosity, $decorated, $formatter);
 
-        $this->stderr = new StreamOutput(fopen('php://stderr', 'w'), $verbosity, $decorated, $formatter);
+        $this->stderr = new StreamOutput(fopen('php://stderr', 'w'), $verbosity, $decorated, $this->getFormatter());
     }
 
     /**

Tests/Output/ConsoleOutputTest.php

@@ -20,5 +20,6 @@ public function testConstructor()
     {
         $output = new ConsoleOutput(Output::VERBOSITY_QUIET, true);
         $this->assertEquals(Output::VERBOSITY_QUIET, $output->getVerbosity(), '__construct() takes the verbosity as its first argument');
+        $this->assertSame($output->getFormatter(), $output->getErrorOutput()->getFormatter(), '__construct() takes a formatter or null as the third argument');
     }
 }

phpunit.xml.dist

@@ -1,14 +1,15 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<phpunit backupGlobals="false"
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.1/phpunit.xsd"
+         backupGlobals="false"
          backupStaticAttributes="false"
          colors="true"
          convertErrorsToExceptions="true"
          convertNoticesToExceptions="true"
          convertWarningsToExceptions="true"
          processIsolation="false"
          stopOnFailure="false"
-         syntaxCheck="false"
          bootstrap="vendor/autoload.php"
 >
     <testsuites>