sign authn and logout requests in the example

Author: Erick Tryzelaar

example/sp-wsgi/sp_conf.py.example

@@ -23,6 +23,8 @@ CONFIG = {
     "description": "Example SP",
     "service": {
         "sp": {
+            "authn_requests_signed": True,
+            "logout_requests_signed": True,
             "endpoints": {
                 "assertion_consumer_service": [
                     ("%s/acs/redirect" % BASE, BINDING_HTTP_REDIRECT),