Usaddress

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* Valid OccupancyType bug fix for OccupancyType that is already valid abbreviation

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* Corrected for late OccupancyType additions and allowed OccpancyType to pass through

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* potentially breaking change. Non-standard unit numbers now converted to a default.
This is based on a real life incident; the original
behavior to allow non-standard unit types to pass through resulted
in an address validation service also allowing the address to pass
through even though no unit should have existed on the home.

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* python 3.7.0 compatibility

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* OpenSource release