CRUD persistence using a table with many to one relation

This PR aims to generate the CRUD for Laboratorio2 in order to test the *many to one* relation between Laboratorio2 and Ente/Afferenza tables.

After updating the db schema you should run the following:
```
php app/console doctrine:mapping:import --force InnovareMainBundle yml

php app/console doctrine:mapping:convert annotation ./src --force
php app/console doctrine:generate:entities InnovareMainBundle

php app/console doctrine:generate:crud
```