Maybe as a followup to #192 we could try to update the bastion arch picture.

It would allow us to put it back on the readme and it would look better on the website :)

Async/await is on the path to stable, and is much clearer to read and write than raw futures. Tokio is also working on futures 0.3 native support, so it would be great to use async/await and futures 0.3 in Raft.

See https://github.com/mozilla/sccache

The library currently implements proposal pipelining, where multiple instances may be decided concurrently. Add in the option to batch multiple proposals and send these out to the replicas as a single request.

• Change proposal command to take a Vec<Bytes>
• Create an add on replica that will wait for size N bytes or send proposals on tick()