Unicorn 0.95.3 - userinfo in absoluteURIs

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 HTTP parser now allows (but does not parse) the userinfo
component in the very rare requests that send absoluteURIs.
Thanks to Scott Chacon for reporting and submitting a test case
for this fix.

There are also minor documentation updates and tiny cleanups.