Beast: WebSocket Benchmarks

[vinniefalco]

If someone could use this benchmarking program to test the performance that would be great:
https://github.com/uWebSockets/uWebSockets/tree/master/benchmarks#websocket-echo-server-benchmarks

[alexhultman]

Current results can be found here: https://github.com/uWebSockets/uWebSockets#benchmarks-table---validate

[vinniefalco]

Thanks for taking the time to run the benchmarks