Decode URL-encoded path matches for Router's req.params.

[ericf]

Router already parses and decodes the URL's query string for req.query. This decodes any URL-encoded matches in the URL's path for req.params.

var router = new Y.Router();

router.route('/:foo', function (req) {
    Y.log(req.params.foo);
});

router.save('/path%20with%20spaces');
// => "path with spaces"