Add specs to ensure good return values
Add specs to ensure good return values

After Invokes or DoesNothing, a faked method's
return value should be the same as if the
method were unconfigured (a Dummy, or a default
value if the type can't be made into a Dummy).

adamralph/FakeItEasy,FakeItEasy/FakeItEasy,thomaslevesque/FakeItEasy,thomaslevesque/FakeItEasy,blairconrad/FakeItEasy,FakeItEasy/FakeItEasy,blairconrad/FakeItEasy,adamralph/FakeItEasy