Stocks on Thursday appeared to be quietly digesting the previous two days' big gains until the Federal Reserve interrupted. The Fed's minutes from its December meeting revealed that several officials favored slowing or stopping stimulus measures before the end of 2013. Stocks reacted, erasing small gains and chalking up moderate losses. The Nasdaq trimmed 0.4% for the day, the NYSE composite 0.3% and the S&P 500 0.2%. The midcap S&P 400, though,