By Madison Williams The former Rockies shortstop is heading to the AL East. View the original article to see embedded media. Former Rockies shortstop Trevor Story is headed to Boston after signing a six-year, $140 million contract, according to USA Today’s Bob Nightengale. Story has an an opt-out after four years. The Red Sox can keep him for a seventh season, which would make the contract $160 million over the seven years. The Yankees, Giants and Astros were also rumored to be in talks of signing Story as a free agent. Story spent his first six seasons with the Rockies, posting a .272/.340/.5…