Add the idea of TryAs(Type, out bool success)

[ipjohnson]

bool success;

c.Export(typeof(BasicService)).TryAs(typeof(IBasicService), out success);

Only exports BasicService if no other IBasicService exist.

Also need to add a TryByInterface and TryByInterfaces to ExportTypeSetConfiguration

[ipjohnson]

I'm going to move this back to 6.3.0 and rethink the method to be more like Autofac

[ipjohnson]

After looking at the implementation for autofac I'm going to mirror the IfNotRegistered and OnlyIf methods