def extract(path)
      files           = files_in_path(path)
      supported_files = filter_files(files)

      parse_files(supported_files)
    end
def extract(path)
      files           = files_in_path(path)
      supported_files = filter_files(files)

      parse_files(supported_files)
    end
Extract strings from files in the given path.
 @param [String] path the path of a directory or file to extract strings
   from.
 @return [POFile] a POFile object, representing the strings extracted from
   the files or file in the specified path.