Add possibility to do custom searches #4
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The idea comes in two parts. First, introduce DjangoQLField object, which represents a searchable field. By default this is a model field, but as the added tests show, this can also be something that doesn't exist on the model.
The second part is that DjangoQLField has method add_search_target() which allows one to do custom annotation on the queryset. When there exists an annotation, it's then possible to just use ordinary .filter() on the queryset.
This is related to issue #3