Setproctitle

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- Added support for Python "diehard" 2.4 (pull request 3).
- Fixed build on Mac OS X 10.9 Maverick (issue 27).

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- Added PyPy support, courtesy of Ozan Turksever - http://www.logsign.net
(pull request 2).

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- The module can be compiled again on Windows (issue 21).

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- No module bug, but a packaging issue: files ``README`` and ``HISTORY``
added back into the distribution.

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- The module works correctly in embedded Python.
- ``setproctitle()`` accepts a keyword argument.
- Debug output support always compiled in: the variable ``SPT_DEBUG`` can be
used to emit debug log.

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- Don't clobber environ if the variable ``SPT_NOENV`` is set (issue 16).