Qrcode

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* Added a ``show`` method to the PIL image wrapper so the ``run_example``
function actually works.

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* Fix a packaging issue

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* Use a pluggable backend system for generating images, thanks to Branko Čibej!
Comes with PIL and SVG backends built in.

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* Encode unicode to utf-8 bytestrings when adding data to a QRCode.

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* When adding data, auto-select the more efficient encoding methods for numbers
and alphanumeric data (KANJI still not supported).

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* Fixed tty output to work on both white and black backgrounds.

* Added `border` parameter to allow customizing of the number of boxes used to
create the border of the QR code