A helper package to use github.com/tidwall/evio more easily

• github.com/tidwall/evio

See http example

• Improve performance. Even with just wake up and immediately replying, it could only reach 17k rps on my machine (just like Node.JS 8.9.2) while with the http example, it averaged at 13k rps. I think this could be hard to do, the benchmark command I use is go-wrk -M POST -H 'Content-Type: application/json' -body '{"data":"ping"}' -c 10 -d 10 -T 500 http://localhost:5000 using go-wrk

• Make this pluggable with Gin (I still don't know how to make http.ResponseWriter to feed Gin engine to)

• Support TLS