Psd-tools

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- [api] Fix incorrect fill layer parse (fix 254)

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- [package] Drop py27 and py35 support
- [psd] Workaround Enum bug (fix 241)
- [composite] Fix transparency issue (fix 242)
- [composite] Fix mask disable flag (fix 243)
- [api] Add workaround for creating PSB (fix 246)
- [api] Fix incorrect adjustment parse (fix 247)

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- [composite] Fix ignored clip layers for groups.
- [composite] Fix out-of-viewport stroke effect.

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- [api] Bugfix for PSDImage composite layer_filter option.
- [api] Bugfix for transparency and alpha distinction.
- [psd] Rename COMPOSITOR_INFO.
- [composite] Fix stroke effect target shape.

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- [api] Bugfix for PSDImage init internal.

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- [psd] Bugfix for CurvesExtraMarker read.