Returns configured DATABASE dictionary from DATABASE_URL.

def config(env=DEFAULT_ENV, default=None, engine=None, conn_max_age=0, ssl_require=False):
    """Returns configured DATABASE dictionary from DATABASE_URL."""

    config = {}

    s = os.environ.get(env, default)

    if s:
        config = parse(s, engine, conn_max_age, ssl_require)

    return config