just some details changed

Some small details.
 *  I found task 15 hard to read, so I changed it a little. Hopefully it will help.
 *  application froze after execution, this is fixed by closing the factory. However, I am not sure if it was not intentional
 *  I added names to both modules, because were named the same in the netbeans and that could lead to misunderstanding

Over all, everything worked as it should, good job :).