try the initial validation idea.
reflect the process result of boolean.
maybe verification of entities done in different method.
since entities maybe invalid during the process.
changed interface; accept $input using setInput.
use getInput to simplify the validate method.
introduce as SimpleValidatorAbstract as simple validation.
methods to clean up certain models, except for specified models.
Merge branch 'validation' of https://github.com/asaokamei/Cena.Cena
Merge branch 'validation'