Add query parser encoding option

Hi, needed UTF-8 support and noticed that the bundle doesn't have an option to set ZendSearch QueryParser encoding, which was the only way i could get it to work properly. Tried a different analyzer but it didn't work, i had problems related to iconv. 
I've made some changes to your bundle to accept a new configuration parameter called query_parser_encoding to set the query parser encoding.

Great tool for those who need to use lucene by the way!!!