You've heard it from the showrunner. You've heard it from the star. And now you've heard it from the head of the network: Homeland is indeed ending with its upcoming eighth season. Showtime Networks CEO David Nevins on Monday confirmed the long-speculated news at the Television Critics Association's summer press tour. "I do not want to hear the word 'cancellation,'" Nevins clarified. "[Co-creator and showrunner] Alex Gansa will bring the show to its proper conclusion. Nevins had been previously shy to call it quits on the pay cabler's No. 1 drama, even though Gansa has been implying season eight would...