Serhii Shushliapin

I spent some time investigating this issue. From the NUnit [docs](http://nunit.org/index.php?p=values&r=2.6.4) > By default, NUnit creates test cases from all possible combinations of the datapoints provided on parameters - the...

This change would make the [IteratorMethodInvokeCommand](https://github.com/AutoFixture/AutoFixture/blob/master/Src/Idioms/GuardClauseAssertion.cs#L406) class redundant and allow to simplify the `GuardClauseAssertion` class removing the unnecessary code. Any comments on that? Thanks!