title: Using django_filters on graphene queries while not using Relay
body: <p>While using graphene with Relay in django, there is an option to use filtering while querying the data.</p>
  
  <pre><code>class AnimalNode(DjangoObjectType):
      class Meta:
          model = Animal
          filter_fields = ['name', 'genus', 'is_domesticated']
          OR
          filter_fields = {
              'name': ['exact', 'icontains', 'istartswith'],
              'genus': ['exact'],
              'is_domesticated': ['exact'],
          }
          interfaces = (relay.Node, )
  </code></pre>
  
  <p>Is it possible to use filtering in this fashion while I'm not using relay or is it a relay-only feature? I don't see any filtering for non-relay in the graphene docs so can't really be sure how to proceed with this.</p>