Add additional meta data to schema and errors#120

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danielbradburn wants to merge 8 commits intopython-openapi:masterfrom

crunchr:schema-additional-metadata

Commits on Mar 9, 2019

added simple test that checks that each schema Exception type can be converted to a string without error
danielbradburn
committed
actually instantiate exception_type in exception test
danielbradburn
committed
removed unused import
danielbradburn
committed