Move avatars into their own components so I can add functionality like custom default avatars and onerror sources without having to add it in 13 separate places. Add the aforementioned features.

skins/base/css/atoms/MemberAvatar.css

@@ -0,0 +1,22 @@
+/*
+Copyright 2015 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.
+*/
+
+.mx_MemberAvatar {
+    z-index: 20;
+    border-radius: 20px;
+    background-color: #dbdbdb;
+}
+

skins/base/css/molecules/MemberTile.css

@@ -31,12 +31,6 @@ limitations under the License.
     position: relative;
 }
 
-.mx_MemberTile_avatarImg {
-    z-index: 20;
-    border-radius: 20px;
-    background-color: #dbdbdb;
-}
-
 .mx_MemberTile_inviteEditing {
     display: initial ! important;
 }