Log Message:
Changes 3.5.0.2:

- max_memory_per_child was measured in kilobytes on Linux, but bytes on
*BSD/MacOS, it's now always kilobytes.

- Windows: Adds support for max_memory_per_child, but requires the
``psutil`` package to be installed.

- Fixed bug in ForkingPickler.loadbuf, where it tried to pass
a BytesIO instance directly to ``pickle.loads`` on Python 2.7.