models.CatanVertex Class
This class represents a vertex. It inherits from BaseContainer. The data in this class (that you get from the JSON model) is independent of the hexgrid, except for the location. Therefore, we leave it up to you to decide how to implement it. It must however implement one function that the hexgrid looks for: 'isOccupied' - look at its documentation. From the JSON, this object will have three properties: location, ownerID and worth. Besides the 'isOccupied' method, you may add any other methods that you need.