* root validators and rename __obj__ -> __root__
* implement root validation
* tweak Validator
* dataclass and generic tests, docs
* repeat and signature checks
* fix inheritance
* tweaks tests and var names
* improvements to 'from_orm' to work better with root validators (#822)
* improvements to 'from_orm' to work better with root validators
* cython compatibility and tweaks
* tweak config order
* added test for derived classes using custom getter_dict config (#833)
* added test for derived classes using custom getter_dict config
* fix linting
* fix formatting
* cleanup
Samuel Colvin