title: Greendao insert into new table issue
body: <p>I'm working on an android app already built by other. and this project has green dao as database framework. This project has already some tables built and working great. recently i've added two tables and tables have also been generated. but the problem is i can't insert into these newly generated tables. is there any thing i've missed like do we have to migrate the database or something if i added new tables? the table dao sessions are also coming null . can somebody give me some ideas about this?</p>