fix bug when adding router to external network
diff --git a/plstackapi/openstack/driver.py b/plstackapi/openstack/driver.py
index 965c612..8b475de 100644
--- a/plstackapi/openstack/driver.py
+++ b/plstackapi/openstack/driver.py
@@ -85,7 +85,8 @@
             nets = self.shell.quantum.list_networks()['networks']
             for net in nets:
                 if net['router:external'] == True: 
-                    self.shell.quantum.add_gateway_router(router, net)
+                    self.shell.quantum.add_gateway_router(router['id'],
+                                                          {'network_id': net['id']})
         
         return router