Removing unused 'use' statements
Updating MockEntity to support "name" property
Updating tests for AbstractPickerDataTransformer
Updating AbstractPickerDataTransformer and extending classes so that they support the transformation of objects into JSON strings
Updating UserPickerDataTransformer tests to assert new functionality of transforming entities to simple objects
Updating ClientPickerDataTransformer tests to assert new functionality of transforming entities to simple objects