Opath

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- Native Python 2 and Python 3 support without using 2to3 during the build
process.

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- Added a ``chunks()`` method to a allow quick iteration over pieces of a
file at a given path.
- Issue 28: Fix missing argument to ``samefile``.
- Initializer no longer enforces `isinstance basestring` for the source
object. Now any object that supplies ``__unicode__`` can be used by a
``path`` (except None). Clients that depend on a ValueError being raised
for ``int`` and other non-string objects should trap these types
internally.
- Issue 30: ``chown`` no longer requires both uid and gid to be provided
and will not mutate the ownership if nothing is provided.

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- Issue 22: ``__enter__`` now returns self.

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- Issue 20: `relpath` now supports a "start" parameter to match the
signature of `os.path.relpath`.

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- Minimum Python version is now 2.5.

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- Issue 5: Implemented `path.tempdir`, which returns a path object which is
a temporary directory and context manager for cleaning up the directory.
- Issue 12: One can now construct path objects from a list of strings by
simply using path.joinpath. For example::

path.joinpath('a', 'b', 'c') or
path.joinpath(*path_elements)