Nick Bilton hadn't worked in TV news before getting the "60 Minutes" gig. Matt Winkelmeyer/Getty Images New "60 Minutes" executive producer Nick Bilton had a drama-filled start to his tenure. Former correspondent Scott Pelley questioned Bilton's qualifications in front of "60 Minutes" staff. Read Bilton's latest memo to "60 Minutes" employees that tries to reassure them about the future. The new top producer at "60 Minutes" is thanking staffers for their work after what he said was "a hell of