Whole bunch of fixes and improvements. Built two .war files, it's working!

- Added JNDI lookup for the `DataSource`. Connection string is handled by the EE Container.
- Added `<title>` tags to all of the pages, injected by controllers.
- Improved connection, closing every connection after the `IEntity` conversion.
- Added `tomcat-conf` folder, containing a bootstrap configuration for the default case.
- Update database schema in `db/script.sql`.
- Exported `rest.war` file.
- Web app built with yeoman.
- Exported `app.war` file.
- Created `web/_server.sh` script for starting the yeoman preview server.
- Created `web/_build.sh` script for building the project with yeoman.
- Created `web/app/_war.sh` script for building a war file from the folder the script is in. The script is automatically copied by `_build.sh` in the distribution folder.
- Created `web/_build_war.sh` scripts, at first it builds, then makes a war file.
- Added `href`: Attivita to Struttura.