Unicorn 3.6.2 and 1.1.7 - OobGC module fix

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:

The optional Unicorn::OobGC[1] (out-of-band GC) module is reimplemented
to fix breakage that appeared in v3.3.1. There are also minor
documentation updates, but no code changes as of 3.6.1 for non-OobGC
users.

There is also a v1.1.7 release to fix the same OobGC breakage
that appeared for 1.1.x users in the v1.1.6 release.

[1] module Unicorn::OobGC