Fixed reference to this module in __init__

[pstoll]

This module wouldn't work for me unless I modified the init function.

For reference:
http://effbot.org/pyfaq/what-is-init-py-used-for.htm

[wkeeling]

Thanks for flagging this. I'd used the package module to simplify the namespace, but hadn't realised that the "ratelimitingfilter.ratelimitingfilter" import was broken.

Thanks again.