Refactor to allow adding attributes
Method for adding individual attributes
Backfill test for provider data
Add interface for yielding provider data
Fix test doubles to use real classes
Refactor data reading and support yielding data
Add ProviderRepeater

Wrapper to yield consecutive iterations of provider e.g. for pagination
or multiple files.
Add repeat block option to DSL
Edit documentation
Refactor duplication
Release version 0.7.0