Remove validate and validateProperties from Validator

[lucascs]

Now we have @Valid we don't need these methods.

[garcia-jj]

I think that:

• Method validate can be removed.
• Method validateProperties and validateProperty can be removed too, because users can use groups to validate some properties, something like @Valid(groups=MYGROUP).

[garcia-jj]

@lucascs, BeanValidator interface and it's default implementation are orphans now. Remove it, or leave in repository to allow users to do a manual validation ?

[lucascs]

If the user really wants, he can inject a javax.validation.Validator. Remove it =)