Ecco, 320 pp., $24.95, July 29Ever since David Sedaris proved that humorous, autobiographical short stories can sell, a crop of new writers has sprung out of nowhere trying to emulate him. Chelsea Handler, Augusten Burroughs, Cynthia Kaplan, and now The Waiter. And like many Sedaris hopefuls, his attempts fall short.After maintaining the blog WaiterRant.net for [...] ...