A lazy man is based on es6. 微信面试题，需要做到以下实现：
LazyMan(“Hank”) //Hi! This is Hank!
LazyMan(“Hank”).sleep(10).eat(“dinner”) // Hi! This is Hank! // 等待10秒.. // Wake up after 10 // Eat dinner~
LazyMan(“Hank”).eat(“dinner”).eat(“supper”) // Hi This is Hank! // Eat dinner~ // Eat supper~
LazyMan(“Hank”).sleepFirst(5).eat(“supper”) // 等待5秒 // Wake up after 5 // Hi This is Hank! // Eat supper