Tweaks for Python 2.7 under Windows

The design of python-process killableprocess is to subclass subproces.Popen and override non-public API methods. Some of those methods changed in Python 2.7, and a new argument is now required. The changes add a new method that adds the new argument when it is not present and handles it the way Python 2.7 does.

python-process-1.0.1

1.0.1 Release of python-processes