Psd-tools

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- documentation updates;
- github repository renamed to psd-tools2;
- AdjustmentLayer fix.

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- layer class structure reorganization;
- add Effects API;
- add TypeLayer API methods.

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- PSDImage user API update;
- user API adds distinct layer types;
- Sphinx documentation.

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- implemented many decodings of image resources and tagged blocks;
- implemented EngineData text information;
- user API for getting mask and patterns;
- user API to calculate bbox for shape layers;

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- Fixed reading of layer mask data (thanks Evgeny Kopylov);
- Python 2.6 support is dropped;
- Python 3.6 support is added (thanks Leendert Brouwer);
- extension is rebuilt with Cython 0.25.2.

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- fixed references decoding (thanks Josh Drake);
- fixed PIL support for CMYK files (thanks Michael Wu);
- optional C extension is rebuilt with Cython 0.23.4;
- Python 3.2 support is dropped; the package still works in Python 3.2,
but the compatibility is no longer checked by tests, and so it can break
in future.
- declare Python 3.5 as supported.