Remove unused fullscreen addon from demo

demo/client.ts

@@ -13,7 +13,6 @@ import { SearchAddon, ISearchOptions } from 'xterm-addon-search';
 import { WebLinksAddon } from 'xterm-addon-web-links';
 
 import * as fit from '../lib/addons/fit/fit';
-import * as fullscreen from '../lib/addons/fullscreen/fullscreen';
 
 // Pulling in the module's types relies on the <reference> above, it's looks a
 // little weird here as we're importing "this" module
@@ -26,7 +25,6 @@ export interface IWindowWithTerminal extends Window {
 declare let window: IWindowWithTerminal;
 
 Terminal.applyAddon(fit);
-Terminal.applyAddon(fullscreen);
 
 let term;
 let attachAddon: AttachAddon;

demo/index.html

@@ -3,7 +3,6 @@
   <head>
     <title>xterm.js demo</title>
     <link rel="stylesheet" href="/src/xterm.css" />
-    <link rel="stylesheet" href="/src/addons/fullscreen/fullscreen.css" />
     <link rel="stylesheet" href="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>
@@ -16,7 +15,7 @@
       <p>
         <label>Find next <input id="find-next"/></label>
         <label>Find previous <input id="find-previous"/></label>
-        <label>Use regex<input type="checkbox" id="regex"/></label> 
+        <label>Use regex<input type="checkbox" id="regex"/></label>
         <label>Case sensitive<input type="checkbox" id="case-sensitive"/></label>
         <label>Whole word<input type="checkbox" id="whole-word"/></label>
       </p>