v1.6.0

• Testing improvements (changed some skips to xfail, added osx in
  Travis).
• Fixed long standing Python 2.7 bug where
  sys.getfilesystemencoding() would be broken after installing a
  threaded manhole. See
  #51.
• Dropped support for Python 2.6, 3.3 and 3.4.
• Fixed handling when socket.setdefaulttimeout() is used.
  Contributed by "honnix" in
  #53.
• Fixed some typos. Contributed by Jesús Cea in
  #43.
• Fixed handling in manhole-cli so that timeout is actually seconds
  and not milliseconds. Contributed by Nir Soffer in
  #45.
• Cleaned up useless polling options in manhole-cli. Contributed by
  Nir Soffer in
  #46.
• Documented and implemented a solution for using Manhole with
  Eventlet. See
  #49.