Two years after losing all four limbs in a bomb explosion in Iraq, a Staten Island soldier was finally given the keys to his new, state-of-the-art home yesterday. And he could not stop smiling. Brendan Marrocco beamed with pride as he crossed the threshold into his new abode in Prince's Bay, which has been tailor-made to suit his every need. "It's very overwhelming. The house is amazing," the 24-year-old said. "I can finally just try to live my life like everybody else. I really appreciate this." Marrocco was behind the wheel of an armored vehicle on Easter Sunday 2009 when...