Implemented custom toString methods.
Fixed dependencies so the project compiles without errors.
* Removed the Post class because it is not needed.
* Updated the label references.
* Implemented proper retrieval of the countries.
Added the importing the countries at application startup.
Implemented the calling of the Fedex, UPS and Post of Slovenia delivery
cost services.
Implemented the displaying of the delivery costs.
Removed the "street" attribute. It is not needed anywhere.
Fixed the UPS web service to return the null when there are no delivery
prices available.