#13 build process

[Jörg Dippel]

I've migrated the JUnit tests to JUnit4.
Besides I've changed the naming convention: 'chess variant'_'description'.
there is no more string "test" within the upper test class name.

Gradle and Ant are fixed and both are working out of the box.
Mvn does not run any tests at the moment.

Maybe if there is time I've a look to it but gradle is the better solution -
also for reportings.