Today I've done some re-engeenering of the classes, and some little changes.

You can find some comments, about the changes of the day, inside the comments:

Moving it in kmedoids folder because it starts to have many kmedoid's functionalities.
I'm valutating the possibility to rename it to a kmedoid clusters class.

Some functionalities was moved from Kmedoids class to Clusters class.
Some method's contract were written. In the Clusters class is missing only one contract.

- I refactored KMedoids class, moving some methods to the Clusters class.
- I modified the implementation of the KMedoids class, now the algorithm do not stop if there were some shadow medoids swappings.
- I inserted the KMedoids.properties file, in which there are the execution values, that could be tuned, in order to customize the algorthm execution.

I inserted the log4j logging system functionality.