Participation is changing the relationship between consumers and fast-food brands as customers move beyond simply ordering products to customizing, remixing and influencing what appears on menus next. Chipotle, Taco Bell and IHOP are turning customer hacks, requests and social-media behaviors into official products, revealing the rise of Fan-Made Innovation. Consumers increasingly want to Make It Mine — and the strongest customer-created ideas can give brands a ready-made pip