remove bundled zmodem.js and symlinked CSS

src/addons/zmodem/demo/app.js

@@ -8,6 +8,8 @@ var terminals = {},
     logs = {};
 
 app.use('/build', express.static(__dirname + '/../../../../build'));
+app.use('/demo', express.static(__dirname + '/../../../../demo'));
+app.use('/zmodemjs', express.static(__dirname + '/../../../../node_modules/zmodem.js/dist'));
 
 app.get('/', function(req, res){
   res.sendFile(__dirname + '/index.html');

src/addons/zmodem/demo/index.html

@@ -4,12 +4,13 @@
         <title>xterm.js demo</title>
         <link rel="stylesheet" href="/build/xterm.css" />
         <link rel="stylesheet" href="/build/addons/fullscreen/fullscreen.css" />
-        <link rel="stylesheet" href="style.css" />
+        <link rel="stylesheet" href="/demo/style.css" />
       	<script src="https://cdnjs.cloudflare.com/ajax/libs/es6-promise/4.1.1/es6-promise.auto.min.js"></script>
       	<script src="https://cdnjs.cloudflare.com/ajax/libs/fetch/1.0.0/fetch.min.js"></script>
         <script src="/build/xterm.js" ></script>
 
         <script src="/build/addons/attach/attach.js" ></script>
+        <script src="/zmodemjs/zmodem.js"></script>
         <script src="/build/addons/zmodem/zmodem.js" ></script>
 
         <script src="/build/addons/fit/fit.js" ></script>

src/addons/zmodem/demo/style.css

@@ -1 +0,0 @@
-../../../../demo/style.css