added setter and getter for transaction group
added setter and getter for transaction group
Vantiv/litle-sdk-for-java,LitleCo/litle-sdk-for-java,StevenOAG/litle-sdk-for-java,rezangit/litle-sdk-for-java,robertsmieja/litle-sdk-for-java,Vantiv/litle-sdk-for-java