unicorn 0.9.1

Minor cleanups, set FD_CLOEXEC on accepted listen sockets
instead of relying on the flag to be inherited across accept.

The 0.9.x series (including this release) is NOT recommended for
production use, try 0.8.x instead.

Eric Wong (10):
      Avoid temporary array creation
      Favor Struct members to instance variables
      Minor cleanups to core
      Unbind listeners as before stopping workers
      Retry listen() on EADDRINUSE 5 times ever 500ms
      Re-add support for non-portable socket options
      Minor cleanups to core (cherry picked from commit ec70433f84664af0dff1336845ddd51f50a714a3)
      always set FD_CLOEXEC on sockets post-accept()
      unicorn 0.8.2
      unicorn 0.9.1 (merge 0.8.2)