Add namespace warnings to README and rbac.yaml

README.rst

@@ -43,6 +43,8 @@ Usage
 
 Deploy the janitor into your cluster via (also works with Minikube_):
 
+    Warning: if you want to deploy janitor to namespace other than ``default``, you need to edit ``/deploy/common/rbac.yaml`` first.
+
 .. code-block:: bash
 
     $ kubectl apply -f deploy/common/

deploy/common/rbac.yaml

@@ -35,4 +35,5 @@ roleRef:
 subjects:
 - kind: ServiceAccount
   name: kube-janitor
+  # change the namespace name below if you want to deploy to a different namespace
   namespace: default