Convert a directory to a pif
    :param directory: Directory to convert to a pif
    :param kwargs: any additional keyword arguments. (See `files_to_pif`)
    :return: the created pif

def directory_to_pif(directory, **kwargs):
    """
    Convert a directory to a pif
    :param directory: Directory to convert to a pif
    :param kwargs: any additional keyword arguments. (See `files_to_pif`)
    :return: the created pif
    """

    # Get the files
    files = [os.path.join(directory, f) for f in os.listdir(directory)
             if os.path.isfile(os.path.join(directory, f))]

    # Run the pif
    return files_to_pif(files, **kwargs)