Now can retrieve only new rules from GAO's database -- i.e., those that have been added to the database since the last retrieval date. This includes new rules that were received by GAO earlier than the last retrieval date but hadn't been added to the database (because of a lag in updating).
New functionality
Now can retrieve only new rules from GAO's database -- i.e., those that have been added to the database since the last retrieval date. This includes new rules that were received by GAO earlier than the last retrieval date but hadn't been added to the database (because of a lag in updating).
Closes #21