Gold edged lower on Friday and was headed for its second consecutive weekly loss, pressured by a stronger dollar and higher oil prices that boosted expectations of interest rate hikes by the U.S. Federal Reserve. Spot gold was down 0.4% at $4,522.89 per ounce by 0222 GMT. The metal was down about 0.3% for the week so far. US gold futures for June delivery lost 0.4% to $4,524.40. The dol