New subfilter module with multi-pattern search support

[fdmitry]

Hi all!

There is a new subfilter module. It uses fast Wu-Manber algorithm for
multi-pattern search. Probably it would be interesting to someone:

https://github.com/dursegov/nginx-subfilter-module

It is possible to add regular expressions support if it is required, but as
a separate engine (i.e. use libpcre instead of builtin Wu-Manber). The
combination of them is a good challenge.

The code may still have bugs, since I don't still have a time to write good
tests.

Thanks

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,237437,237437#msg-237437