Vistautils

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New Features
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- Parameters can now optionally interpolate environmental variables (`68 <https://github.com/isi-vista/vistautils/issues/68>`_)

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No significant changes.

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New Features
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- Distribute type information via PEP 561 (`45 <https://github.com/isi-vista/vistautils/issues/45>`_)

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Bugfixes
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- Update for breaking changes in immutablecollections 0.4.0 (`42 <https://github.com/isi-vista/vistautils/issues/42>`_)


New Features
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- Initial implementation of indexing utility for objects with `Span`s (`42 <https://github.com/isi-vista/vistautils/issues/42>`_)

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New Features
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- Add support for getting the closest set to a given value in a RangeSet
Add support for getting the value associated to the closest key set with a given value in RangeMap (`40 <https://github.com/isi-vista/vistautils/issues/40>`_)

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New Features
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- Allow specifying limited set of valid options to string() in Parameters (`33 <https://github.com/isi-vista/vistautils/issues/33>`_)