Add GroupAvatar to handle fallback images etc.

And a few misc tidyups

src/components/structures/GroupView.js

@@ -15,17 +15,18 @@ limitations under the License.
 */
 
 import React from 'react';
+import PropTypes from 'prop-types';
 import MatrixClientPeg from '../../MatrixClientPeg';
 import sdk from '../../index';
 import { sanitizedHtmlNode } from '../../HtmlUtils';
 import { _t } from '../../languageHandler';
 
 
-module.exports = React.createClass({
+export default React.createClass({
     displayName: 'GroupView',
 
     propTypes: {
-        groupId: React.PropTypes.string.isRequired,
+        groupId: PropTypes.string.isRequired,
     },
 
     getInitialState: function() {
@@ -64,21 +65,13 @@ module.exports = React.createClass({
     },
 
     render: function() {
-        const BaseAvatar = sdk.getComponent("avatars.BaseAvatar");
+        const GroupAvatar = sdk.getComponent("avatars.GroupAvatar");
         const Loader = sdk.getComponent("elements.Spinner");
 
         if (this.state.summary === null && this.state.error === null) {
             return <Loader />;
         } else if (this.state.summary) {
             const summary = this.state.summary;
-            let avatarNode = null;
-            if (summary.profile && summary.profile.avatar_url) {
-                avatarNode = <BaseAvatar
-                    url={MatrixClientPeg.get().mxcUrlToHttp(summary.profile.avatar_url)}
-                    name={summary.profile.name}
-                    width={48} height={48}
-                />;
-            }
             let description = null;
             if (summary.profile && summary.profile.long_description) {
                 description = sanitizedHtmlNode(summary.profile.long_description);
@@ -103,7 +96,11 @@ module.exports = React.createClass({
                     <div className="mx_RoomHeader">
                         <div className="mx_RoomHeader_wrapper">
                             <div className="mx_RoomHeader_avatar">
-                                {avatarNode}
+                                <GroupAvatar
+                                    groupId={this.props.groupId}
+                                    groupAvatarUrl={summary.profile.avatar_url}
+                                    width={48} height={48}
+                                />
                             </div>
                             <div className="mx_RoomHeader_info">
                                 {nameNode}

src/components/structures/MyGroups.js

@@ -43,7 +43,7 @@ const GroupTile = React.createClass({
     }
 });
 
-module.exports = WithMatrixClient(React.createClass({
+export default WithMatrixClient(React.createClass({
     displayName: 'GroupList',
 
     propTypes: {

src/components/views/avatars/GroupAvatar.js

@@ -0,0 +1,62 @@
+/*
+Copyright 2017 Vector Creations 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.
+*/
+
+import React from 'react';
+import PropTypes from 'prop-types';
+import sdk from '../../../index';
+import MatrixClientPeg from '../../../MatrixClientPeg';
+
+export default React.createClass({
+    displayName: 'GroupAvatar',
+
+    propTypes: {
+        groupId: PropTypes.string,
+        groupAvatarUrl: PropTypes.string,
+        width: PropTypes.number,
+        height: PropTypes.number,
+        resizeMethod: PropTypes.string,
+    },
+
+    getDefaultProps: function() {
+        return {
+            width: 36,
+            height: 36,
+            resizeMethod: 'crop',
+        };
+    },
+
+    getGroupAvatarUrl: function(props) {
+        return MatrixClientPeg.get().mxcUrlToHttp(
+            this.props.groupAvatarUrl,
+            this.props.width,
+            this.props.height,
+            this.props.resizeMethod,
+        );
+    },
+
+    render: function() {
+        const BaseAvatar = sdk.getComponent("avatars.BaseAvatar");
+
+        return (
+            <BaseAvatar
+                name={this.props.groupId[1]}
+                idName={this.props.groupId}
+                url={this.getGroupAvatarUrl()}
+                {...this.props}
+            />
+        );
+    }
+});

src/components/views/dialogs/CreateGroupDialog.js

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import React from 'react';
+import PropTypes from 'prop-types';
 import sdk from '../../../index';
 import dis from '../../../dispatcher';
 import { _t } from '../../../languageHandler';
@@ -28,7 +29,7 @@ const GROUP_REGEX = /^\+(.*?):(.*)$/;
 export default React.createClass({
     displayName: 'CreateGroupDialog',
     propTypes: {
-        onFinished: React.PropTypes.func.isRequired,
+        onFinished: PropTypes.func.isRequired,
     },
 
     getInitialState: function() {