Plantuml

Documentation here:
https://pypi.python.org/pypi/sphinxcontrib-plantuml

In order to use plantuml extension, it is needed to modify the doc/conf.py:
- Enabling the extension (line with extensions)
- Specifying the path for plantuml.jar (line with plantuml)

Install the extension with one pip command:
sudo pip install sphinxcontrib_plantuml

After that is possible to generate (html and pdf) UML diagrams, writing in UML syntax.