Implement add_knight_data to generate data directly.
Removed knight_data fixture.
Implemented remove_knight_data.
Added traitor BooleanField to roundtable Knight model.
Generated schema migration for traitor field.
Add False default to traitor BooleanField.
Generated schema migration to account for traitor field default.
Remove third and fourth migrations.
Generated correct migration for traitor BooleanField, following check system.
Generated empty migration file for Lacelot's betrayal.
Renamed latest migration.
Created skeleton data migration.
Implemented set_lancelot_traitor in migration.
Implemented unset_lancelot_traitor in migration.
Created skeleton check for str model method existence.
Implemented new check for all models.
Limited new check to roundtable app.
Limited new check to non-contributed apps.
Refactored new check to make single call to app registry.
Moved new check in project module.