Never say never. Ailing burger giant McDonald's will test kale as part of a breakfast bowl that will be served in nine southern California locations. Kale will also be used in three revamped salads at McDonald’s in Canada, according to a report last week by an analyst at Janney Capital Markets. It's a chagrin moment for McD's, given its ads in January taunting “vegetarians, foodies, and gastronauts” while vowing that the Big Mac “will never be kale.” The Big Kale, however...