ketama consistent hashing update

[Richard Jones]

ketama is a consistent hashing library we use in our memcached clients, 
mentioned on this list a few months ago. I've updated our public svn:

* libketama changed to BSD license
* minor tweaks/optimisations
* 'make test' has a basic regression test and hashing distribution check
* added python_ketama (from blogg.se folks)

svn://svn.audioscrobbler.net/misc/ketama

There is also a (slightly outdated) patch in the patches dir to replace md5 
hashing with FNV-1a, which is ~60% faster, which i am yet to merge properly.

-- 
Richard Jones
Last.fm Ltd. | http://www.last.fm/
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