Add support for `data-selector`

[kkeiper1103]

Using just data-id and data-class are rather limiting. Please add support for data-selector, so we can build our own jQuery selector for the target el.

jquery.joyride-2.1.js, Line 400 change to

var cl = settings.$li.attr('data-class'),
        id = settings.$li.attr('data-id'),
        selector = settings.$li.attr("data-selector"),
        $sel = function () {
          if (selector) {
              return $( selector );
          } else if (id) {
            return $(settings.document.getElementById(id));
          } else if (cl) {
            return $('.' + cl).filter(":visible").first();
          } else {
            return $('body');
          }
        };

[ksjones]

Great suggestion, I've removed the class and id parts, having an open selector is great. Thanks

[nacesprin]

What about this?