add floathead as dependency

lib/jquery/floatthead.js

-"use strict";
+'use strict';
 
 Object.defineProperty(exports, "__esModule", {
     value: true
@@ -9,6 +9,9 @@ exports.responsiveScroll = responsiveScroll;
 /**
  * Created by gavorhes on 6/22/2016.
  */
+var $ = require('jquery');
+global.jQuery = $;
+
 require('floatthead');
 
 /**

src/jquery/floatthead.js

 /**
  * Created by gavorhes on 6/22/2016.
  */
+const $ = require('jquery');
+global.jQuery = $;
+
 require('floatthead');