Log Message:
3.3.0.18 - 2014-06-20
---------------------
- Now compiles on GNU/kFreeBSD
- Pool: `AF_PIPE` address fixed so that it works on recent Windows versions
  in combination with Python 2.7.7.
- Pool: Fix for `Supervisor object has no attribute _children` error.
- Pool: Fixed bug with human_status(None).
- Pool: shrink did not work properly if asked to remove more than 1 process.