Cpf() Brazil Extensions Should Respect Formatting and Context

[bchavez]

The following unit test should pass:

void Main()
{
   Randomizer.Seed = new Random(1337);
   var p = new Person();
   p.Cpf().Should().Be("358.355.632-13");
   p.Cpf(includeFormatSymbols:false).Should().Be("35835563213");
}

The issue is formatting parameter should respect the person context cache.

Regarding #269 #270 and @ArthNRick.