LevenshteinFilter proposal

[karl.wright]

Hi Folks,

I'm very interested in using (or developing!) a Levenshtein Filter within the 
family of Solr Filter objects. I don't see such a class today anywhere. I see 
how the AutomatonQuery object would permit such a thing to be built, but to 
date I don't know of anyone who has built one. Do you?  If not, I'm willing to 
give it a whirl.  Also, AutomatonQuery doesn't seem to come up when I look for 
it in the javadocs for Lucene - can you point me in the correct direction?
Thanks!
Karl