Get a list of all the Physiobank databases available.

    Examples
    --------
    >>> dbs = get_dbs()

def get_dbs():
    """
    Get a list of all the Physiobank databases available.

    Examples
    --------
    >>> dbs = get_dbs()

    """
    url = posixpath.join(config.db_index_url, 'DBS')
    response = requests.get(url)

    dbs = response.content.decode('ascii').splitlines()
    dbs = [re.sub('\t{2,}', '\t', line).split('\t') for line in dbs]

    return dbs