SQLite ORM Constraints

There are some constraint to respect to get Kripton working well as light ORM:

• Every table must have a long primary key. Said in other words, every model object have to contain a field long used as primary key.
• Every DAO can produce/insert/update only model object of its declared bean type. This means that you can also use inner join or whatever, but when you use a select you can extract only columns of model associated to the DAO interface.