[IronPython] New clr.ImportExtensions (LINQ) Syntax

[Dino Viehland]

Dave wrote:
> Okay. Never mind. There's already an open bug for this I just found.
> 
> http://ironpython.codeplex.com/workitem/30379

I've assigned this bug to myself.  I'll take a look and fix it, my guess is
there's something wrong with extension method support on generic
classes (e.g. class Foo<T> : IEnumerable<T>) that needs to be fixed in our
type inferer.