#22 Fluent assertions for both common and specific API responses

GitHub: https://github.com/PramodKumarYadav/restpro Goal: - Refactor assert classes so that user can do all assertions in one fluent method chain. Objective: - Refactor Verify Response assert class and child assert classes, so that user can do all assertions in one fluent method chain. Next steps: - Add method for doing JSON Schema validation.