im add robot avatar

@@ -381,7 +381,7 @@ var chat = {
                 break;
             case allTypes.ROBOT_SEND:
                 viewData.from = 'rebot';
-                viewData.avatar = socketConf.defaultUserHead;
+                viewData.avatar = socketConf.rebotUserHead;
                 break;
 
             default:

-/* global gDomains */
+/* global gDomains, gAssetURI */
 /**
  * socket config
  *
@@ -9,6 +9,7 @@
 var config = {
     servers: [gDomains.imSocket],
     defaultUserHead: '//img10.static.yhbimg.com/headimg/2013/11/28/09/01cae078abe5fe320c88cdf4c220212688.gif',
+    rebotUserHead: `${gAssetURI}/img/service/chat/im-robot.png`,
     recType: {
         ENTER: 1,                 // 用户进入
         LINK_SUCCESS: 2,          // 连线人工客服回应