title: Using Authorization methods on a nested Resource
body: <p>Is it possible for tastypie to understand that I want it to use the same authorization methods for filtering out objects from a nested Resource?</p>
  
  <pre><code>class ProjectResource(ModelResource):
      def authorized_read_list(self, object_list, bundle):
          return object_list.filter(user=bundle.request.user) # return projects only the user created
  
  class ProjectGroupResource(ModelResource):
      projects = ToManyField(
          ProjectResource,
          attribute='projects',
          null=True,
          blank=True
      )
  </code></pre>
  
  <p>The <code>authorized_read_list</code> method doesn't fire when accessing the <code>ProjectGroupResource</code>, so I get all projects, including non-user created ones. I was under the assumption that since I'm passing a ProjectResource ref, it would attempt to simulate a get_object_list, which should trigger authorized_read_list with the bundle.</p>