show progress info and download code (styling is very much in progress)

static/index.html

@@ -17,6 +17,8 @@
     <h2>Files selected:</h2>
     <ul id="file_list">
     </ul>
+    <div id="download_link"></div>
+    <div id="progress"></div>
     <script src="upload.js"></script>
   </body>
 </html>