Opath

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- 23: Added support for symbolic masks to ``.chmod``.

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- The ``open`` method now uses ``io.open`` and supports all of the
parameters to that function. ``open`` will always raise an ``OSError``
on failure, even on Python 2.
- Updated ``write_text`` to support additional newline patterns.
- The ``text`` method now always returns text (never bytes), and thus
requires an encoding parameter be supplied if the default encoding is not
sufficient to decode the content of the file.

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- ``path`` class renamed to ``Path``. The ``path`` name remains as an alias
for compatibility.

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- ``chown`` now accepts names in addition to numeric IDs.

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- Drop support for Python 2.5. Python 2.6 or later required.
- Installation now requires setuptools.

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- Allow arbitrary callables to be passed to path.walk ``errors`` parameter.
Enables workaround for issues such as 73 and 56.