Qrcode

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* Bad version number for previous hotfix release.

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* Fix bad QR code generation due to the regex comma fix in version 4.0.2.

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* Fix incorrect regex causing a comma to be considered part of the alphanumeric
set.

* Switch to using setuptools for setup.py.

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* Fix the pymaging backend not able to save the image to a buffer. Thanks ilj!

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* Made qrcode work on Python 2.4 - Thanks tcely.
Note: officially, qrcode only supports 2.5+.

* Support pure-python PNG generation (via pymaging) for Python 2.6+ -- thanks
Adam Wisniewski!

* SVG image generation now supports alternate sizing (the default box size of
10 == 1mm per rectangle).

* SVG path image generation allows cleaner SVG output by combining all QR rects
into a single path. Thank you, Viktor Stískala.

* Added some extra simple SVG factories that fill the background white.

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* Update change log to contain version 3.1 changes. :P

* Give the ``qr`` script an ``--optimize`` argument to control the chunk
optimization setting.