Auto-reconnect for embedded demo

embedded.html

@@ -63,6 +63,7 @@
             allow_contact_requests: false, // Contacts from other servers cannot,
                                            // be added and anonymous users don't
                                            // know one another's JIDs, so disabling.
+            auto_reconnect: true,
             authentication: 'anonymous',
             auto_login: true,
             auto_join_rooms: [