List all playlists.

def find_all(connection=None, page_size=100, page_number=0,
        sort_by=DEFAULT_SORT_BY, sort_order=DEFAULT_SORT_ORDER):
        """
        List all playlists.
        """
        return pybrightcove.connection.ItemResultSet("find_all_playlists",
            Playlist, connection, page_size, page_number, sort_by, sort_order)