Citi Research has lowered its S&P EPS targets for the end of this year and for 2014, based on slightly weaker numbers from Europe, the possibility of a tax increase, and lack of confidence outside the investment class, according to a note from Citi Research analysts Tobias Levkovich, Lorraine Schmitt, and Christina Wood. Citi lowered its GDP forecast for developing economies With 92 percent of the S&P 500 (INDEXSP:.INX) reporting, earnings came in about 1 percent below the Citi forecast, though it was 3 percent better than Street numbers which had already been revised down. Additional reports from Europe show that…