Add proper "retry" support for basic postgres restart

rattail_demo/web/app.py

@@ -14,6 +14,9 @@ def main(global_config, **settings):
     """
     This function returns a Pyramid WSGI application.
     """
+    # set some defaults for postgres
+    app.provide_postgresql_settings(settings)
+
     # prefer demo templates over tailbone
     settings.setdefault('mako.directories', ['rattail_demo.web:templates',
                                              'tailbone:templates',])