Jonathan Dayton and Valerie Faris arrived at their first Sundance Film Festival feeling worn down. Making their debut feature, Little Miss Sunshine , had taken much longer than they’d anticipated; financing hiccups had forced the pair to spend years rescuing the film from development hell. But by the time Dayton and Faris left Park City, Utah, in January 2006, they were practically rock stars: Little Miss Sunshine , about a scrappy family trying to make it to a children’s beauty pageant, had