connect-datastore 'kind' configured incorrectly

[thebrengun]

In app.js in 4-auth, 5-logging, 6-pubsub, and 7-gce the configuration object {kind: 'express-sessions'} is incorrectly passed into the Datastore constructor. I believe it should be passed to the DatastoreStore constructor alongside the dataset key. This fails silently and works anyways because within the connect-datastore module kind is set to 'Session' if no configuration is found. So I propose this:

store: new DatastoreStore({
  dataset: new Datastore({kind: 'express-sessions'}),
}),

Be changed to this:

store: new DatastoreStore({
  dataset: new Datastore(),
  kind: 'express-sessions',
}),

wherever it occurs. I can submit a pull request.