(Reuters) - It is no mystery why the National Football League's (NFL) Ravens have been embraced by the city of Baltimore after being imported from Cleveland 17 years go. A Super Bowl triumph in 2001, nine playoff berths and a shot at hoisting the championship Lombardi Trophy for a second time on February 3 when they face the San Francisco 49ers in New Orleans has helped the Purple-and-Black win hearts in the Charm City. ...