Require hls.js from npm (#456)

* hlsjs

* Fix webpack libraryTarget config

src/bundle.js

@@ -4,6 +4,11 @@
 // Use define from require.js not webpack's define
 var _define = window.define;
 
+// jstree
 var jstree = require("jstree");
 require("jstree/dist/themes/default/style.css");
 _define("jstree", ["jQuery"], function() { return jstree; });
+
+// hlsjs
+var hlsjs = require("hls.js");
+_define("hlsjs", function() { return hlsjs; });