Move NaturalSort_DefaultCollator to its own file

lib/private/naturalsort.php

@@ -9,16 +9,6 @@
 
 namespace OC;
 
-class NaturalSort_DefaultCollator {
-
-	public function compare($a, $b) {
-		if ($a === $b) {
-			return 0;
-		}
-		return ($a < $b) ? -1 : 1;
-	}
-}
-
 class NaturalSort {
 	private static $instance;
 	private $collator;
@@ -114,4 +104,3 @@ class NaturalSort {
 		return self::$instance;
 	}
 }
-

lib/private/naturalsort_defaultcollator.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * Copyright (c) 2014 Vincent Petry <PVince81@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ *
+ */
+
+namespace OC;
+
+class NaturalSort_DefaultCollator {
+	public function compare($a, $b) {
+		if ($a === $b) {
+			return 0;
+		}
+		return ($a < $b) ? -1 : 1;
+	}
+}