Integration of IQuackFu and generic extensions (e.g. Linq)

I tried to use Linq methods to process results returned by method IQuackFu.QuackInvoke. Because you are reading this issue you could guess that I did not succeed.
There are two problems in runtime Boo environment which prevents using non-Boo generic extensions.
First is that there is no method to register CLR extensions in RuntimeServices.
Second is that runtime method resolver doesn't resolve generic method definitions.

I propose to add RegisterClrExtensions method to Boo.Lang.Runtime.ExtensionRegistry. Also I propose to add logic resolving generic method definitions to Boo.Lang.Runtime.MethodResolver.

Test case:

"""
3
"""
import Boo.Lang.Compiler
import Boo.Lang.Compiler.Ast
import System.Collections.Generic

class Foo(IQuackFu):

def QuackSet(name as string, parameters as (object), value) as object:
return null

def QuackGet(name as string, parameters as (object)) as object:
return null

def QuackInvoke(name as string, args as (object)) as object:
l1 = (1,)
l2 = (2,3)

if name == "Invoke1":
return l1

return l2

Boo.Lang.Runtime.RuntimeServices.RegisterClrExtensions(System.Linq.Enumerable)

foo = Foo()
l3 = foo.Invoke1().Concat(foo.Invoke2())
print l3.Count()