Features

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Simplified feature set string parsing.

Relaxed ``fileconfig``, ``concepts``, and ``graphviz`` dependencies to < 1.0.

Improved documentation.

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Added extended Sphinx-based documentation.

Fixed Python 3.5 compatibility.

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Fixed broken manual install due to ``setuptools`` automatic zip_safe analysis not
working as expected.

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Added ``string_extent`` attribute to feature sets.

Added simple example to README.

Moved feature name sanity checks to parser.

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Added wheel.

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Added Python 3.3+ support.