Node.ext.directory

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- Remove deleted keys from internal reference after ``__call__`` in order
to return the correct result when adding a file or directory with the same
key again.
[rnix, 2015-07-20]

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- Use try/except instead of iteration to check whether directory child already
in memory.
[rnix, 2015-05-12]

-----

- Always use ``os.chmod`` for setting directory permissions, not only if
already exists.
[rnix, 2015-03-03]

---

- Introduce ``fs_mode`` on directories and files.
[rnix, 2015-03-03]

---

- Return empty list in ``File.lines`` if no data.
[rnix, 2015-02-18]

- Consider filesystem encoding. Defaults to UTF-8.
[rnix, 2015-02-18]

- Tree locking on modification.
[rnix, 2014-09-02]

- Prevent empty keys in ``__setitem__``.
[rnix, 2014-09-02]

- Use ``plumbing`` decorator.
[rnix, 2014-08-25]

---

- introduce ``default_file_factory`` on directories for controlling default
file child creation.
[rnix, 2013-12-09]

- move file logic in ``FileStorage`` behavior.
[rnix, 2013-08-06]

- make ``file_factories`` a class property on directory storage.
[rnix, 2013-08-06]

- make ``ignores`` a class property on directory storage.
[rnix, 2013-08-06]

- Cleanup interfaces.
[rnix, 2013-08-06]