Added MUC plugin

Author: andersevenrud

package.json

@@ -7,7 +7,8 @@
   },
   "dependencies": {
     "hyperapp": "^1.2.10",
-    "strophe.js": "^1.3.4"
+    "strophe.js": "^1.3.4",
+    "strophejs-plugin-muc": "^1.1.0"
   },
   "files": [
     "dist/",

src/app.js

@@ -27,6 +27,7 @@
  * @author  Anders Evenrud <andersevenrud@gmail.com>
  * @licence Simplified BSD License
  */
+import 'strophejs-plugin-muc';
 import {$pres, Strophe} from 'strophe.js';
 import {createConnectionWindow} from './connection-window.js';
 import {createChatWindow} from './chat-window.js';