Made dir handling private to prevent abuse

h5p/h5p-moodle-plugin#48
HFJ-1845

h5p-default-storage.class.php

@@ -297,13 +297,10 @@ class H5PDefaultStorage implements \H5PFileStorage {
    * Recursive function that makes sure the specified directory exists and
    * is writable.
    *
-   * TODO: Will be made private when the editor file handling is done by this
-   * class!
-   *
    * @param string $path
    * @return bool
    */
-  public static function dirReady($path) {
+  private static function dirReady($path) {
     if (!file_exists($path)) {
       $parent = preg_replace("/\/[^\/]+\/?$/", '', $path);
       if (!self::dirReady($parent)) {