Repoze-filesafe

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- Add ``file_exists`` and ``file_path`` functions which know about files
created and removed during the transaction.
[fschulze]

- Throw OSError if src of rename doesn't exist.
[fschulze]

- Dropped backward compatibility stuff for older API.
[fschulze]

- Removed pre Python 2.6 support.
[fschulze]

- Removed testing of Python 3.2, added Python 3.4, 3.5 and 3.6.
[fschulze]

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- Add a new ``repoze.filesafe.rename_file`` function to move files.

- Add additional ``recursive`` parameter to allow ``repoze.filesafe.rename_file``
to use ``os.renames``, i.e. recursively create/remove intermediate directories.

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- Fix OSError exceptions raised when deleting a non-existing file to have the
right errno value.

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- Update dummy datamanger to create BytesIO mock files if the file is
opened in binary mode.

- Update internal function naming to PEP8.

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- Add support for Python 3.2 / 3.3.

- Note explicit support for Python 2.6 / 2.7.

- Drop support for Python < 2.6.

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- Remove the need for a middleware. Instead the current transaction is
automatically joined if needed.
[wichert]

- PEP8.
[wichert]

- Restructure package to faciliate automated testing.
[wichert]