Protean

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* Minor fixes for issues found while migrating SQLAlchemy plugin to 0.0.8 version
* `delete` method should query by value of `id_field` instead of hard-coded `id`

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* Introduction of `find_by()` method for Entities
* Introduction of `save()` method for Entities
* Support for Query Operators (>, >=, <, <=)
* Support for Conjunction Operators (AND, OR) in queries
* Change Fields to be full-fledged Descriptors to control getting/setting values
* Introduction of Support for References and Associations (HasOne and HasMany)
* Remove Pylint from static code analysis and use Flake8

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* Rename `Repository` to `Adapter`
* Rename `Schema` to `Model`
* Enhance Entity class to perform CRUD methods instead of relying on a separate Repo Factory

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* Repository rewritten from the ground up
* First base version for overall Protean functionality

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* Add Context Class

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* Add UseCase Utility Classes
* Add Repository Abstract Classes