Rpaths

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Features:
* Extended glob filters (� la git, /some/dir*/**/*.log)
* Python 3.2 compatibility

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Bugfixes:
* Fixes non-working `Pathrel_path_to()`.

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Features:
* Adds `pattern` parameter to `listdir()` and `recursedir()`

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Bugfixes:
* Adds missing `__all__` lists
* Actually prevents the creation of `AbstractPath` directly (thanks to VnC-)

Features:
* Adds comparison operators

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Bugfixes:
* `Path.read_link()` didn't work at all.
* `AbstractPath.__eq__()` now returns False instead of raising TypeError if the
objects are not compatible.

Features:
* Adds `AbstractPath.lies_under()`
* `Path.open()` uses `io.open()`. It now accepts the buffering, encoding,
errors, newline, closefd and opener arguments, and will return unicode
instead of bytes if opened in text mode (the default) on Python 2.

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Bugfixes:
* Makes `__hash__` use `normcase` (like `__eq__` does).
* Removes `AbstractPath.relative()` since it only worked for `Path` anyway.
* Fixes `*atime` methods.

Features:
* Adds docstrings everywhere. There is some HTML documentation at ReadTheDocs:
http://rpaths.remram.fr/