add IconButton as in design

src/components/views/elements/IconButton.js

@@ -0,0 +1,34 @@
+/*
+ Copyright 2016 Jani Mustonen
+
+ 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.
+ */
+
+import React from 'react';
+import PropTypes from 'prop-types';
+import AccessibleButton from "./AccessibleButton";
+
+export default function IconButton(props) {
+    const {icon, className, ...restProps} = props;
+
+    let newClassName = (className || "") + " mx_IconButton";
+    newClassName = newClassName + " mx_IconButton_icon_" + icon;
+
+    const allProps = Object.assign({}, restProps, {className: newClassName});
+
+    return React.createElement(AccessibleButton, allProps);
+}
+
+IconButton.propTypes = Object.assign({
+    icon: PropTypes.string,
+}, AccessibleButton.propTypes);