Java8Matcher where matcher argument returns a Matcher

[arian]

Basic idea, add a method with the signature:

public static <I, O> Matcher<I> where(DescribableFunction<? super I, O> property, Function<I, Matcher<? super O>> matcher);

So you could write:

assertThat(someList, where(String::toUpperCase, str -> equalTo(str)));

my actual use case is a bit more complex than this.