Use querysets in OSLER_AUDIT_BLACK_LIST

[justinrporter]

Currenly, IP addresses are given.

Ideally, we would use a list of dictionaries, using QuerySet syntax, to specify the blacklist.

Thus, we could say, for example, {'user_ip': '192.168.1.1', 'method': 'GET', 'status_code':302, 'url': '/'} instead of blacklisting all requests from '192.168.1.1'.