returner() doesn't record method calls

[garybernhardt]

Imported from BitBucket:

Reported by Gary Bernhardt / garybernhardt, created 6 months ago.

A method created with returns= records its calls:
>>> d = Dingus(x__returns=5)
>>> d.x()
5
>>> d.calls
[('x', (), {}, 5)]
but a method created with returner() doesn't:
>>> d = Dingus(x=returner(5))
>>> d.x()
5
>>> d.calls
[]

[garybernhardt]

I want to deprecate "returner"; it's confusing anyway.