Chipotle Mexican Grill, which has stumbled in the wake of food scares and failed to pass the taste test with its introduction of a new queso dish, may finally be staging a turnaround. Solid financial results appear to have validated the company's ambitious plans to regain its status as a darling of diners seeking healthy, fast meals. It launched a loyalty program and plans to open 130 to 150 new locations in 2018.