Senf

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* Fixed missing normalization with :func:`path2fsn` on Linux + Python 3

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* New :func:`supports_ansi_escape_codes`
* New :func:`fsn2norm` (+ all API now returns normalized fsnative)
* :func:`fsn2uri`: various fixes

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* `uri2fsn`: improve error handling on unescaped URIs :bug:`4`

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* ``isinstance(path, fsnative)`` now checks the value as well. If True
passing the instance to `path2fsn` will never fail.

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* `fsnative`: safeguard against containing null bytes. All operations
converting to `fsnative` will now fail if the result would contain null
bytes. This means passing `fsnative` to functions like :func:`open` is now
always safe.

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* :func:`print_`: Don't ignore ``flush`` in Windows redirect mode
* :obj:`argv`: Forwards changes to `sys.argv` :bug:`2`
* :obj:`environ`: Forwards changes to `os.environ` :bug:`2`
* :obj:`environ`: Handle case insensitive env vars on Windows
* :func:`fsn2text`: Add a ``strict`` mode
* :func:`fsn2uri`: Always return `text`
* :func:`fsn2bytes`: Merge surrogate pairs under Python 3 + Windows
* :func:`fsn2bytes`: Support ``utf-16-be`` under Python 2.7/3.3