[issue20218] Add `pathlib.Path.write` and `pathlib.Path.read`

[Christopher Welborn]

Changes by Christopher Welborn <cjwelborn at live.com>:


Removed file: http://bugs.python.org/file33782/pathlib.readwrite3_with_exclusive.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20218>
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