Add interfaces for File and Directory wrappers

src/Directory.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Licensed under the MIT license:
+ * http://opensource.org/licenses/MIT
+ */
+
+namespace Icewind\Streams;
+
+/**
+ * Interface for stream wrappers that implements a directory
+ */
+interface Directory {
+	/**
+	 * @param string $path
+	 * @param array $options
+	 * @return bool
+	 */
+	public function dir_opendir($path, $options);
+
+	/**
+	 * @return string
+	 */
+	public function dir_readdir();
+
+	/**
+	 * @return bool
+	 */
+	public function dir_closedir();
+
+	/**
+	 * @return bool
+	 */
+	public function dir_rewinddir();
+}