Make ChangeAvatar support room avatars and tweak RoomAvatar respond to componentWillReceiveProps

src/controllers/atoms/RoomAvatar.js

@@ -34,13 +34,24 @@ module.exports = {
     },
 
     getInitialState: function() {
-        this.urlList = this.getUrlList();
-        this.urlListIndex = -1;
+        this._update();
         return {
             imageUrl: this._nextUrl()
         };
     },
 
+    componentWillReceiveProps: function(nextProps) {
+        this._update();
+        this.setState({
+            imageUrl: this._nextUrl()
+        });
+    },
+
+    _update: function() {
+        this.urlList = this.getUrlList();
+        this.urlListIndex = -1;
+    },
+
     _nextUrl: function() {
         do {
             ++this.urlListIndex;