Removed JUnit tests


When creating the installer (running mvnassemply.cmd) there are a couple
of problems related to the JUnit tests, libraries are not included.
AbstractVan updated

Overriden onHitRobot and created new methods:
- onHitAnimal
- onHitStone
- onHitTreasure
- onHitVan

checkVanName is now private.