Cristiano Ronaldo delivered an exclamation point to an already sterling day with a brilliant bicycle kick finish that may well have sent Real Madrid to the Champions League semi-final.   The Portuguese superstar had already produced for the Champions League holders, having turned home an Isco cross in the third minute to give Madrid a 1-0 lead in the first leg of their quarter-final tie against Juventus at the Allianz Stadium. Then, in the 64th minute, going away from goal, Ronaldo leaped into the air to meet a cross from Daniel Carvajal and put enough power on the shot to…