Each evening the scruffy tabby cats listen for a single voice, the distant squeak of a rusty cart.  Mary Burns, making her rounds,  For more than a quarter of a century, she has fed the lost cats of Miami Beach.  8 Hours a day.  Every day.  Restaurants along her way give food.  Veterinarians help her tend the sick.  Mary has been a voyager all her life.  She came from Yugoslavia.  She simply took the Statue of Liberty at its word.