Add method to get all DAOs available

[bryant1410]

No description provided.

[greenrobot]

Why would you want to expose that?

[bryant1410]

In order to delete all entities of all types, being independent of which ones exists

[greenrobot]

Hmm, will think about it. It would be like reflection to access the metamodel for the app.

[bryant1410]

I use it in the following method:

public static void deleteAll() {
    for (AbstractDao<?, ?> dao : getDaoSession().getAllDaos()) {
        dao.deleteAll();
    }
}