Top ABC News producer Don Ennis walked into his Manhattan office on Friday in a "little black dress" and a brunette bobbed wig and announced to colleagues that from now on, he would like to be known as Dawn. The 49-year-old father of three said he's splitting from his wife of 17 years to become a woman, or Dawn Stacey Ennis, as she is now known on her governmental records. "Today I begin anew," she wrote on her Facebook timeline, where she debuted a flirty new profile picture. "Please understand: This is not a game of dress-up, or make-...