Pypel

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* Enable travis CI.

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* Add Python3 support.
* Switch to GExiv2 for XMP metadata management.
* Switch to Pillow for testing.

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* Refactor Receipt class to use a class based model.
* Add note field to Receipt model.
* Enhance version handling.

- Add __version_info__ tuple and switch to __version__
for human readable form.

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* First public release.