Modifications for the JavaCard tutorial in Developer Portal

- Simplified JavaCard example cardlet
- Added simple Java program to test the cardlet
@petter-fidesmo That's the case in all the terminals and examples I have seen, but maybe is not always true. Maybe I just should write "select the contactless reader you are using - this will work for my dual interface reader" and then in the tutorial
"if your reader has dual contact/contactless interfaces, or if you have more than one reader connected, select the right one from the list printed out"