NEW YORK - Oil prices briefly fell below $50 per barrel Thursday for the first time since May 25, 2005, after the government reported larger-than-expected jumps in crude oil and gasoline inventories. Oil has dropped 17 percent since the end of 2006 amid weeks of mild winter weather in the U.S. Northeast, a key consumer of heating fuels, and growing energy stockpiles. "There's no doubt that this is significant," said Phil Flynn of Alaron Trading Corp. "If you're a bull, the only thing you can hold your hat on is they didn't close below $50." The price for a barrel...