Various fixes esp. on Windows

Author: nicolas-grekas

Definition/Dumper/XmlReferenceDumper.php

@@ -257,7 +257,7 @@ private function writeLine($text, $indent = 0)
         $indent = strlen($text) + $indent;
         $format = '%'.$indent.'s';
 
-        $this->reference .= sprintf($format, $text)."\n";
+        $this->reference .= sprintf($format, $text).PHP_EOL;
     }
 
     /**

Tests/Definition/Dumper/XmlReferenceDumperTest.php

@@ -34,7 +34,7 @@ public function testNamespaceDumper()
 
     private function getConfigurationAsString()
     {
-        return <<<EOL
+        return str_replace("\n", PHP_EOL, <<<EOL
 <!-- Namespace: http://example.org/schema/dic/acme_root -->
 <!-- scalar-required: Required -->
 <!-- enum: One of "this"; "that" -->
@@ -75,6 +75,7 @@ enum=""
 
 </config>
 
-EOL;
+EOL
+        );
     }
 }