The Dow jumped 829 points Friday on shockingly high U.S. jobs numbers. Even in the topsy-turvy world of tanker stocks, where good news can often be bad news, equities ended green across the board. Tanker stocks posted low- to mid-single-digit gains on below-average trading volumes. Nordic American Tankers (NYSE: NAT) rose by 7.8%, Teekay Tankers …