Show match index in place of match count

This is the implementation of https://trello.com/c/0GXqt5GF/1089-s-find-next-indicate-current-match-index.
seems like this isn't really necessary since state.reslultSet.lengh can just be used.  You could add a getter for `foundAny` if this is just to make life easier in other places:

`this.__defineGetter__("foundAny", function() { return this.resultSet.length > 0; });`