Add UI for changing room avatars and update UI when room avatars change

src/skins/vector/views/atoms/RoomAvatar.js

@@ -44,8 +44,8 @@ module.exports = React.createClass({
 
     render: function() {
         var style = {
-            'max-width': this.props.width,
-            'max-height': this.props.height,
+            maxWidth: this.props.width,
+            maxHeight: this.props.height,
         };
         return (
             <img className="mx_RoomAvatar" src={this.state.imageUrl} onError={this.onError}