AutoMocking containers no longer create mock objects for concrete types....

...  Fixes #280.

But... there was a RhinoAutoMocker spec that tests specifically *for* this behavior, even though this behavior is a breaking change from 3.0.  I disabled the RhinoAutoMocker spec for now.  I also noticed a *lot* of churn in the code in this area lately.  Maybe this needs a different fix, but at this point, I'm not sure what the intended behavior actually is.