Better sign out.

frontend/src/js/page/wb-app.js

@@ -48,7 +48,7 @@ class WBApp extends Component {
 
         <WBSignIn path="/sign-in" appState={ this.state } />
 
-        <WBSignOut path='/sign-out' />
+        <WBSignOut path='/sign-out' app={ this } />
 
         <WBBrowse path="/browse/:ownerUuid?/:activePage?/:objTypeTab?/:collectionPage?/:processPage?/:workflowPage?"
           appState={ this.state }

frontend/src/js/page/wb-sign-out.js

@@ -3,9 +3,12 @@ import { route } from 'preact-router';
 
 class WBSignOut extends Component {
   componentDidMount() {
-    delete window.localStorage['arvHost'];
-    delete window.localStorage['arvToken'];
-    delete window.localStorage['currentUser'];
+    const { app } = this.props;
+    const keys = ['arvHost', 'arvToken', 'currentUser'];
+    for (let i = 0; i < keys.length; i++) {
+      delete app.state[keys[i]];
+      delete window.localStorage[keys[i]];
+    }
     route('/sign-in');
   }