Unicorn 1.1.4 - small bug fix and doc updates

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 no longer unlinking actively listening sockets upon startup
(but continue to unlink dead ones). This bug could trigger
downtime and nginx failures if a user makes an error and
attempts to start Unicorn while it is already running.

Thanks to Jordan Ritter for the detailed bug report leading to
this fix.

ref:
http://mid.gmane.org/[email protected]

There are also minor documentation and test updates pulled in
from master. This is hopefully the last bugfix release of the
1.1.x series.