Who would have guessed? Beef jerky is going upscale.Driven by the growing trend of healthy snacks, meat snack makers are rolling out products with innovative flavors and all-natural options targeted at health-conscious consumers looking for nourishing protein.And the food industry has taken notice.General Mills, Inc. this year purchased Epic Provisions, a maker of products ranging from jerky bites to trail mix, while The Hershey Co. last year acquired Krave, a manufacturer of specialty meat snac...