Add pascal image segmentation example
Add pascal image segmentation example

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