Cruise stocks are absolutely surging today. Whether investors are looking at Carnival (NYSE:CCL), Royal Caribbean (NYSE:RCL) or Norwegian Cruise Line (NYSE:NCLH), gains of between 4% and 8% are in order during the Tuesday session. Given that we’re still in earnings season, investors may be correct in assuming earnings have something to do with this move. Carnival reported second-quarter earnings which surprised the market and analysts, showing a quarterly profit of 11 cents per share on revenue of $5.78 bil ...