really rename pbl to model in example :-/
really rename pbl to model in example :-/

amueller/pystruct,wattlebird/pystruct,pystruct/pystruct,d-mittal/pystruct,d-mittal/pystruct,massmutual/pystruct,wattlebird/pystruct,amueller/pystruct,pystruct/pystruct,massmutual/pystruct