0.3.0

CHANGES:

• Set the internal pipe used to interrupt a domain to a non-blocking mode and
  remove the usage of an atomic which protect how we fill the pipe
  (@haesbaert, @dinosaure, #28)
• Expose option to reuse addr/port when we Miou_unix.bind_and_listen
  (@ada2k, @dinosaure, #27)
• Protect an illegal access to the orphan from a possibly parallel task which
  does not own the orphan value
  (@poytypic, @dinosaure, #31, #32)
• Be able to pin a specific domain when we want to launch a parallel task
  (@dinosaure, #34)
• Expose the Miou.Backoff module which can be useful for users
  (@dinosaure, #35)
• Fix or improve (from the maintainance point-of-view) the Miou.Queue module
  and some internal parts of Miou about the usage of atomics
  (@dinosaure, @polytypic, #36, #33)
• Prefer to require a finaliser function for the events value and actually
  close the internal Unix.pipe used to interrupt domain than to use
  Gc.finaliser and possibly leak file-descriptors
  (spotted by @hannesm, @dinosaure, #37)