fixing backend_status and README update

Change-Id: I1e17776447330c4e92e1ae738d488d5f475e55d2
diff --git a/xos/gui/conf/app/mapconstants.local.js b/xos/gui/conf/app/mapconstants.local.js
index 217b8c0..cd2a207 100755
--- a/xos/gui/conf/app/mapconstants.local.js
+++ b/xos/gui/conf/app/mapconstants.local.js
@@ -18,5 +18,5 @@
 
 angular.module('app')
   .constant('MapConfig', {
-    marker: './xos/extensions/vnaasgui/app/img/co.png',
+    marker: './xos/extensions/vnaas/app/img/co.png',
   });