Extend support for special types

I've noticed that you can automatically Locate an IEnumerable<Func<T>> but not an Func<IEnumerable<T>> (or at least I've been unable to make it work). 

I think it would make sense when you want to declare a dependency on a single factory that returns all known exports for T.

```c#
public MyClass(Func<IEnumerable<IWhatEver>> knownWhateverFactory)
```