fastbean-au

The Jabber bot looks like it requires both 'delete' and 'all' to be implemented for storage methods. CoreBot already checks for the existence of 'get' and 'save', but not 'delete'...

Looking at the other plugins (those listed [here](https://botkit.ai/docs/readme-middlewares.html#storage-modules-1)): CouchDB and Datastore support all four methods Firestore, MySQL and Postgres (not maintained) do not support 'delete'