log4j not initialized correctly

[darioamorosodaragona-tuni]

Seems that log4j is not initialized correctly (was not able to see any log in the terminal, jut the warning from log4j stating a not proper configuration for the logger).

To fix the problem and see the log in the terminal I had to add the following lines in GitLogExtractor.java and GitTruckFactor.java:

import org.apache.log4j.BasicConfigurator;
[...]
//in the main or in the constructor
BasicConfigurator.configure();