adding simple validator mock

This class will help people to test their validations

closes #14 
So how can we solve this problem @garcia-jj?

Otávio Garcia <notifications@github.com> escreveu no dia Wed Dec 10 2014 at
6:43:38 PM:

> In
> src/main/java/br/com/caelum/vraptor/simplevalidator/SimpleValidator.java
> <https://github.com/caelum/vraptor-simple-validator/pull/16#discussion-diff-21635406>
> :
>
> >  import br.com.caelum.vraptor.validator.Validator;
> >
> >  public class SimpleValidator{
> >  	
> > -	private final Container container;
> > -	private final Validator validator;
> > -	private final DefaultValidationStrategyHelper strategy;
> > +	protected Container container;
> > +	protected Validator validator;
> > +	protected DefaultValidationStrategyHelper strategy;
>
> Its not a good design to expose internal representations to child classes.
> Allowing this child classes can change instances, causing some undesired
> behaviors.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/caelum/vraptor-simple-validator/pull/16/files#r21635406>
> .
>