Log Message:
Update ruby-unicorn to 4.3.1.

=== unicorn 4.3.1 - shutdown() fixes / 2012-04-29 07:04 UTC

  * Call shutdown(2) if a client EOFs on us during upload.
    We can avoid holding a socket open if the Rack app forked a
    process during uploads.

  * ignore potential Errno::ENOTCONN errors (from shutdown(2)).
    Even on LANs, connections can occasionally be accept()-ed but
    be unusable afterwards.

  Thanks to Joel Nimety <jnimety@continuity.net>,
  Matt Smith <matt@nearapogee.com> and George <lists@southernohio.net>
  on the mongrel-unicorn@rubyforge.org mailing list for their
  feedback and testing for this release.

=== unicorn 4.3.0 - minor fixes and updates / 2012-04-17 21:51 UTC

  * PATH_INFO (aka REQUEST_PATH) increased to 4096 (from 1024).
    This allows requests with longer path components and matches
    the system PATH_MAX value common to GNU/Linux systems for
    serving filesystem components with long names.

  * Apps that fork() (but do not exec()) internally for background
    tasks now indicate the end-of-request immediately after
    writing the Rack response.

  Thanks to Hongli Lai, Lawrence Pit, Patrick Wenger and Nuo Yan
  for their valuable feedback for this release.

=== unicorn 4.2.1 - minor fix and doc updates / 2012-03-26 21:39 UTC

  * Stale pid files are detected if a pid is recycled by processes
    belonging to another user, thanks to Graham Bleach.
  * nginx example config updates thanks to to Eike Herzbach.
  * KNOWN_ISSUES now documents issues with apps/libs that install
    conflicting signal handlers.