[noise] Echo server and benchmarks

[Alex]

I'm currently hosting an "echo server" which will echo back to you any
payloads received. The server supports all combinations of handshake
patterns, ciphers, DH schemes, hashes, etc.

The current server information (host, port, etc.) can be located
here[0], and information on the protocol can be located here[1].

I also ran benchmarks[2] on all 512 combinations of handshakes
(Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz (3400.10-MHz K8-class CPU)).

-- 
Alex

[0] http://centromere.github.io/cacophony/
[1] https://github.com/centromere/cacophony#example-code
[2] http://centromere.github.io/cacophony/benchmarks.html