[ANN] unicorn 5.5.0.pre1 - Rack HTTP server for fast clients and Unix

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.

Disclaimer:

Due to its ability to tolerate crashes and isolate clients, unicorn
is unfortunately known to prolong the existence of bugs in applications
and libraries which run on top of it.

* https://bogomips.org/unicorn/
* public list: unicorn-public@bogomips.org
* mail archives: https://bogomips.org/unicorn-public/
* git clone https://bogomips.org/unicorn.git
* https://bogomips.org/unicorn/NEWS.atom.xml
* nntp://news.public-inbox.org/inbox.comp.lang.ruby.unicorn

This is a pre-release RubyGem intended for testing.

Changes:

unicorn 5.5.0.pre1

Jeremy Evans contributed the "default_middleware" configuration option:

  https://bogomips.org/unicorn-public/20180913192055.GD48926@jeremyevans.local/

Jeremy also contributed the ability to use separate groups for the process
and log files:

  https://bogomips.org/unicorn-public/20180913192449.GE48926@jeremyevans.local/

There's also a couple of uninteresting minor optimizations and
documentation additions.

Eric Wong (10):
      remove random seed reset atfork
      use IO#wait instead of kgio_wait_readable
      Merge branch '5.4-stable'
      shrink pipes under Linux
      socket_helper: add hint for FreeBSD users for accf_http(9)
      tests: ensure -N/--no-default-middleware not supported in config.ru
      doc: update more URLs to use HTTPS and avoid redirects
      deduplicate strings VM-wide in Ruby 2.5+
      doc/ISSUES: add links to git clone-able mail archives of our dependencies
      README: minor updates and additional disclaimer

Jeremy Evans (2):
      Make Worker#user support different process primary group and log file group
      Support default_middleware configuration option

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