Humanbingo

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Updated history file for version 3.0.0.

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Added the PDF writer. Pass :code:`-F pdf` to explicitly write PDF files.

Backwards-incompatible changes: YAML input and PDF output are now default.

Improved refactoring and documentation.

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Added the ability to specify card sets with a YAML file instead of the
old XML format. Pass :code:`-f yaml` to :code:`humanbingo`.

Lots of improvements to documentation.

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Pretty big refactoring into separate modules, in order to facilitate
extensibility, practice dependency injections, etc. But no functional
change yet.

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Flesh out history file.

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Name change: "Name Bingo" to "Human Bingo". The latter sounds
more interesting and seems to be the more popular term.

Morphing this script into a bona fide python package to upload to PyPI.
Using the pypackage_ cookiecutter, add a :code:`setup.py` script so
that it can be installed with pip_.

.. _pypackage: https://github.com/audreyr/cookiecutter-pypackage
.. _pip: https://pypi.python.org/pypi/pip

Now :code:`pip install` will install an executable file :code:`humanbingo`,
and the original :code:`bingo.py` module/script is gone. So this is a
backwards-incompatible change.