Charticle

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Changes:
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Add `charticle.hierarchy` diagrams and examples.

Supports general text and polygon arguments for outer triangle & layers.

Cleanups:

- wishlist, release procedures added to repo.
- Jupyter notebooks removed from repo.
- py27 testing included in `tox.ini`.
- refactoring validators.
- cleaned up release procedure.

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Changes:
^^^^^^^^

Support Venn2 diagrams (and Venn3).

Improve documentation examples and testing.


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Changes:
^^^^^^^^

First released version to pypi.

venn.Venn3 is only working charticle type right now.


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Previously unreleased versions didn't have working docs or tests.