Procrunner

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* Unicode fixes. Fix crash on invalid UTF-8 input.
* Clarify that stdout/stderr values are returned as bytestrings.
* Callbacks receive the data decoded as UTF-8 unicode strings
with unknown characters replaced by \ufffd (unicode replacement
character). Same applies to printing of output.
* Mark stdin broken on Windows.

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* Maintenance release to add some tests for executable resolution.

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* Fix Win32 API executable resolution for commands containing a dot ('.') in
addition to a file extension (say '.bat').

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* Fix Win32API dependency installation on Windows.

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* New keyword 'win32resolve' which only takes effect on Windows and is enabled
by default. This causes procrunner to call the Win32 API FindExecutable()
function to try and lookup non-.exe files with the corresponding name. This
means .bat/.cmd/etc.. files can now be run without explicitly specifying
their extension. Only supported on Python 2.7 and 3.5+.

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* Python 2.7 support on Windows. Python3 not yet supported on Windows.