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* Updated BWIPP to monolithic package 2013-11-11.
* Changed to use hexadecimal string literal for passing
codestring/optionstring to BWIPP (18).
* Fixed bugs in rendering, culculating size, etc.
* All simbologies are now sane, except RSS14 Expanded.
* Pillow support.
* setup.py test now uses py.test.
* Automated tests on drone.io.