/**
  * Calculate MD5 hash for files in the specified directory.
  *
  * @param string $directory Directory path relative to PW's root
  * @param string $exclude Array of paths to be excluded
  * @param boolean $recursive If TRUE, the directory is scanned recursively
  * @return array Associative array [filename] => [MD5 hash]
  */
 public function getFilesMD5($directory, $exclude, $recursive = false)
 {
     return $this->connection->getFilesMD5($directory, $exclude, $recursive);
 }