Add message spinner component.

src/components/views/elements/MessageSpinner.js

@@ -0,0 +1,36 @@
+/*
+Copyright 2015, 2016 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';
+
+const React = require('react');
+
+module.exports = React.createClass({
+    displayName: 'MessageSpinner',
+
+    render: function() {
+        const w = this.props.w || 32;
+        const h = this.props.h || 32;
+        const imgClass = this.props.imgClassName || "";
+        const msg = this.props.msg || "Loading...";
+        return (
+            <div className="mx_Spinner">
+                <div className="mx_Spinner_Msg">{msg}</div>&nbsp;
+                <img src="img/spinner.gif" width={w} height={h} className={imgClass}/>
+            </div>
+        );
+    },
+});