Fix Specs - Issue #381

We remove the show method when we call .send(:actions, :all, :except => :show) as we can see [here](https://github.com/josevalim/inherited_resources/blob/master/lib/inherited_resources/class_methods.rb#L78-L80).
So we can't call `actions` twice to redo the method, which I think is really fair.

This PR fixes the specs which sometimes want the method back. 

https://github.com/josevalim/inherited_resources/issues/381