Make model columns extends interface
Use PersistentModel for database objects
Use PersistentModel.UNSET_ID in model objects
Fix up funny pom dependency.
Add ORMlite dependency
Initial ORMLite annotations. Add Restriction class.
Getters/Setter for Restriction
Add column definitions
Add foreign key restrictions
Remove useless onTerminate()
Update Activities use new Database. Requires implementation of queries!