Rust: hyper on tokio-proto/service

[nayato]

Refresh for hyper benchmark based on tokio-proto and tokio-service.
serde-derive is used for json serialization as that's what people
will do in real app.

[mention-bot]

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[nayato]

@seanmonstar @steveklabnik @alexcrichton @polachok PTAL

[nayato]

@polachok just noticed a couple hours back that there's #2611. I aligned my changes to your PR now and will rebase once yours is in.

[alexcrichton]

Ah yeah I was otherwise just going to recommend #2611, but other than that looks great!