ClientUtils escape query

[Grant Ingersoll]

ClientUtils.escapeQueryChars seems a bit aggressive to me in terms of  
what it escapes.  It references http://lucene.apache.org/java/docs/queryparsersyntax.html#Escaping 
 Special Characters, but doesn't explicitly escape them, instead  
opting for the more general \W regex.  Thus, I'm noticing that chars  
that don't need to be escaped ( like / ) are being escaped.

Anyone recall why this is?  I suppose the problem comes in when one  
considers other query parsers, but maybe we should just mark this one  
as explicitly for use w/ the Lucene QP?

-Grant