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New Features
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- - split_key_value_store now works with binary key-value stores as well (`120 <https://github.com/isi-vista/vistautils/issues/120>`_)
- - in `Parameters`, the user can now assert exactly one of a set of parameters is present. (`121 <https://github.com/isi-vista/vistautils/issues/121>`_)
- - alters `Parameters.object_from_parameters` to make it easier to specify constant values as well as factories
- implements `.keys()` for path-mapping key-value sources
- Better `repr` for `ZipBytesFileKeyValueSource` (`131 <https://github.com/isi-vista/vistautils/issues/131>`_)