Ctparse

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* Removed nb module
* Fix for two digit years
* Freshly retrained model binary file

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* Fix run_corpus refactoring bug
* Implemented retraining utilities

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* update develop dependencies
* remove unused Protocol import from typing_extensions

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* split ctparse file into several different modules
* added types to public interface
* introduced the Scorer abstraction to implement richer scoring strategies

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* Added python 3.7 to supported versions (fix on travis available)

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* First release on PyPI.