Made the url option more versatile

[warrickhill]

So I needed a way to have the query as part of the URI and not as get params on the end

eg. "search/for/part" + query;

now the url option can be a function which has the query as a param

url: function (query) { return "search/for/part" + query; }

[eduo]

I was looking around to see if someone had tackled this already, thanks.