PHILADELPHIA (AP) - The city's former treasurer was sentenced to 10 years in prison on corruption charges Tuesday in a federal investigation that came to light when an FBI bug was discovered in the mayor's office. Corey Kemp was found guilty in May of taking part in a scheme to trade city contracts for gifts, favors and cash. The case hinged on telephone calls, secretly recorded by the FBI over nine months, in which Kemp and Democratic fundraiser Ronald A. White talked about shaking down businessmen for contributions and other payments. The FBI also bugged Mayor John F. Street's City...