Fixes https://github.com/keithnorm/Classy/issues/1 - improve performance with style lookup table
ensure style index is reset when stylesheet path is reset
implementing feedback from PR https://github.com/cloudkite/Classy/pull/66 - separate style node indexes for objectClass and styleClass into separate properties
Merge pull request #66 from keithnorm/master

Improve performance with style lookup table