Spavro

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- Pypi requires a full version to update the description, attempting to add the
markdown version of the description to pypi

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- Fix bug with namespace handling where names with 'dots' in them were still
being concatenated with the namespace leading to bogus names
- The array data 'check' function also had a bug where it was not verifying that
the datum was a list before attempting to check that all items conformed to the schema

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- Fix bug with C implementation of zig zag decoder. Additional unnecessary cast was clipping during the bit shifting for larger numbers.
- Skipping 1.1.8 and 1.1.9 was missing C cythonized code and created incompatibilities with python 2.7

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- Fix bug with 'bytes' type in union schemas failing to parse

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- Fix bug with reference types (named references) inside unions

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- Remove accidental debug loglevel logging directive