Billings Gazette: A group of more than 50 Billings area residents gathered on the north bank of the Yellowstone River at Coulson Park on Monday, chanting, waving signs and making a simple demand. Holding signs that said "Pay Your Fine" and "Take Responsibility," the group asked ExxonMobil Corp. to pay in full $1.7 million in penalties proposed by the federal government in relation a July 2011 spill that dumped 63,000 gallons of crude oil into the Yellowstone River. "Today we're asking for not only individual responsibility,...