Psd-tools2

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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.

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- implemented extraction of embedded files (embedded smart objects) -
thanks Volker Braun;
- optional C extension is rebuilt with Cython 0.21.2.
- hg mirror on bitbucket is dropped, sorry!

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- improved METADATA_SETTING decoding (thanks Evgeny Kopylov);
- layer comps decoding (thanks Evgeny Kopylov);
- improved smart objects decoding (thanks Joey Gentry);
- user API for getting layer transforms and placed layer size
(thanks Joey Gentry);
- IPython import is deferred to speedup ``psd-tools.py`` command-line utility;
- ``_RootGroup.__repr__`` is fixed;
- warning message building is more robust;
- optional C extension is rebuilt with Cython 0.21.1.

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- Fixed reading of images with layer masks (thanks Evgeny Kopylov);
- improved mask data decoding (thanks Evgeny Kopylov);
- fixed syncronization in case of ``8B64`` signatures (thanks Evgeny Kopylov);
- fixed reading of layers with zero length (thanks Evgeny Kopylov);
- fixed Descriptor parsing (thanks Evgeny Kopylov);
- some of the descriptor structures and tagged block constants are renamed (thanks Evgeny Kopylov);
- PATH_SELECTION_STATE decoding (thanks Evgeny Kopylov);
- the library is switched to setuptools; docopt is now installed automatically.