Tutorial and knowledge base working in progress

Updated the knowledge base and tutorials and added an example repository with source codes and generated jar files also:

• We reduced the tutorials, so that each tutorial contains only one description with sources. For each tutorial we created a full working example and explain it.
• On the knowledge base we put a schematic illustration of our agent cycle and compare it with the original Jason cycle.

Tutorials and knowledge base are heavily under developing, because we would like to use LightJason also in teaching