Zbarlight

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- Officially support Python 3.6.
- Drop Python 2.6 support

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- Fix Install for setuptools < 22.0

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* Use zest.releaser
* Use tox
* Do not include tests and docs in package

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* Add generic ``scan_codes()`` function (which can scan multiple codes in the same image)
* Fix Python 2.6 tests
* Exclude tests from package

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* Minor fixes on Readme
* Include requirements-dev.txt in Manifest

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* First public version.