Nuke LogoutButton; nothing used it.

src/controllers/atoms/LogoutButton.js

@@ -1,27 +0,0 @@
-/*
-Copyright 2015 OpenMarket Ltd
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-'use strict';
-
-var dis = require("../../dispatcher");
-
-module.exports = {
-    onClick: function() {
-        dis.dispatch({
-            action: 'logout'
-        });
-    },
-};