New formula: spdylay

An experimental implementation of SPDY in C.

Also provides Spdycat (a SPDY client), Spdyd (a SPDY server), and Shrpx
(a reverse proxy for SPDY/HTTPS).

Source: <https://github.com/tatsuhiro-t/spdylay>

I wasn't able to get this to compile with the system zlib, so it requires tapping homebrew/dupes in order to build.