fixing backend_status and README update

Change-Id: I1e17776447330c4e92e1ae738d488d5f475e55d2
diff --git a/xos/gui/conf/app/mapconstants.production.js b/xos/gui/conf/app/mapconstants.production.js
index 12c3498..17b6dd0 100755
--- a/xos/gui/conf/app/mapconstants.production.js
+++ b/xos/gui/conf/app/mapconstants.production.js
@@ -18,5 +18,5 @@
 
 angular.module('vnaasgui')
   .constant('MapConfig', {
-    marker: './extensions/vnaasgui/app/img/co.png',
+    marker: './extensions/vnaas/app/img/co.png',
   });