allowed_to_visit? method may be ignoring namespacing when checking permissions for an object

``` ruby
def allowed_to_visit?(link)
  permitted_to?(link.action, link.object)
end
```

In the above snippet, I'm wondering if `link.object` should actually be `link.object_array`.  Because `link.object` is just returning the last item of the array. So is it taking into account namespaced objects?

https://github.com/biola/action_links/blob/master/lib/action_links/helpers.rb#L79
