Implementation of Video Queue (show queue, add and remove entries)

I chose to create a resource under user to allow access to queues using routes that include the user ID.  But I also kept the my_queue route at root which is sent to the same controller.  The controller is tolerant of an omitted user_id and assumes it to mean the current logged in user.  Note that this complicated my test writing so I had to write extra tests for various cases of user_id supplied and omitted.

You can use the `each_with_index` iterator and the index variable will be managed for you.