decorating validators, CompoundValidator

Hi group,
hello Ian,

Can we introduce a Consecutive/Stepper/Decorating validator or reanimate the 
CompoundValidator, so the developer can combine decorators?
    email = Decorating(String(), Email())
This could basically act like All but the output of the left validator is 
handled over to its right neighbor. (And vice versa, in case of from_python())
    # value is the input
    # op in ['to_python', 'from_python']
    # I will leave out reversion of decorated_validators for the latter.
    for validator in decorated_validators:
        value = getattr(validator, op)(value)
    return value

What do you think? Is there a more efficient way?

-- Mark

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