Adding page:before-change for turbolinks

snippet_areYouSure.js

    if (!settings.silent && !window.aysUnloadSet) {
      window.aysUnloadSet = true;
      $(window).bind('beforeunload', function() {
        $dirtyForms = $("form").filter('.' + settings.dirtyClass);
        if ($dirtyForms.length == 0) {
          return;
        }
        // Prevent multiple prompts - seen on Chrome and IE
        if (navigator.userAgent.toLowerCase().match(/msie|chrome/)) {
          if (window.aysHasPrompted) {
            return;
          }
          window.aysHasPrompted = true;
          window.setTimeout(function() {window.aysHasPrompted = false;}, 900);
        }
        return settings.message;
      });
      $(document).bind('page:before-change', function() {
        $dirtyForms = $("form").filter('.' + settings.dirtyClass);
        if ($dirtyForms.length == 0) {
          return;
        }
        // Prevent multiple prompts - seen on Chrome and IE
        if (navigator.userAgent.toLowerCase().match(/msie|chrome/)) {
          if (window.aysHasPrompted) {
            return;
          }
          window.aysHasPrompted = true;
          window.setTimeout(function() {window.aysHasPrompted = false;}, 900);
        }
        return confirm(settings.message + "\n\nAre you sure you want to leave this page?");
      });
    }