Rename model.instance.errors to model.instance.$errors to match .$valid in ngModelController, and to avoid potential naming conflicts with instance attributes named 'errors.'
Update example app to use $errors
Update model.instance.valid to model.instance.$valid to match ngModelController and avoid potential naming collisions.
Update model.instance.invalid to model.instance.$invalid to match ngModelController and avoid potential naming collisions.
Release v0.2.0