Unicorn 3.3.1 and 1.1.6 - one minor, esoteric bugfix

Unicorn is an HTTP server for Rack applications designed to only serve
fast clients on low-latency, high-bandwidth connections and take
advantage of features in Unix/Unix-like kernels. Slow clients should
only be served by placing a reverse proxy capable of fully buffering
both the the request and response in between Unicorn and slow clients.

Changes:

We now close the client socket after closing the response body.
This does not affect most applications that run under Unicorn,
in fact, it may not affect any.

There is also a new v1.1.6 release for users who do not use
kgio.