Segno

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* Fixed Python packaging

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* Added "color" parameter to the LaTeX serializer to define the color of the
dark modules.
* Fixed serious issue `23 <https://github.com/heuer/segno/issues/23>`_:
Segno creates invalid QR Codes if boost_error is not disabled
(enabled by default)

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* Removed ``utils.matrix_with_border_iter``
* Fixed `21 <https://github.com/heuer/segno/issues/21>`_
(type error while writing to terminal under Windows)
* Added option to serialize QR Codes as LaTeX vector graphic
* Added module ``segno.helpers`` which provides additional factory functions
to create common QR Codes like a WIFI configuration, a geo location or MeCard

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* Changed API: Added a feature to increase the error correction level
if it fits. Disable this feature via ``boost_error=False``
(`16 <https://github.com/heuer/segno/issues/16>`_)
* Added ``--no-error-boost`` to the command line script to disable error
correction level incrementation (`17 <https://github.com/heuer/segno/issues/17>`_)
* Command line script: Internal changes and better test coverage
* Added tests for issue `18 <https://github.com/heuer/segno/issues/18>`_
* Added PBM (P1 and P4) serialization.
* Deprecated ``utils.matrix_with_border_iter``, use ``utils.matrix_iter``
* ``utils.matrix_with_border_iter`` will be removed in the next release
* API change: ``QRCode.matrix_iter(border)`` -> ``QRCode.matrix_iter(scale=1, border=None)``

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* Fixed setup

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* Added QRCode.matrix_iter(border) which returns an iterator over the matrix and
includes the border (as light modules).
* Invalid (empty) SVG identifiers / class names are ignored and do not result
into an invalid SVG document (issue `8 <https://github.com/heuer/segno/issues/8>`_).
* SVG serializer: If ``unit`` was set to ``None``, an invalid SVG document was
generated (issue `14 <https://github.com/heuer/segno/issues/14>`_).
* Better command line support:

- The command line script recognizes all SVG options (`9 <https://github.com/heuer/segno/issues/9>`_)
- Added ``--mode``/``-m``, renamed ``--mask``/``-m`` to ``--pattern``/``-p``
(issue `10 <https://github.com/heuer/segno/issues/10>`_)
- The script used an empty string as default value for the data to encode.
The data to encode has no default value anymore
(issue `11 <https://github.com/heuer/segno/issues/11>`_)
- Added ``--no-ad`` to omit the comment ``Software`` in PNG images
(issue `12 <https://github.com/heuer/segno/issues/12>`_)