Controller generator uses shared code, but the specs are not shared.

When I did  `rails generate curate:work Text`
I got a controller spec with this line in it:

``` ruby
it_behaves_like 'is_a_curation_concern_controller', Text, actions: :all
```

```
in `find_and_eval_shared': Could not find shared examples "is_a_curation_concern_controller" (ArgumentError)
```

It does the same in the actor spec: `is_a_curation_concern_actor`
