Serialize response.

        :return response: Instance of django.http.Response

def emit(self, content, request=None, emitter=None):
        """ Serialize response.

        :return response: Instance of django.http.Response

        """
        # Get emitter for request
        emitter = emitter or self.determine_emitter(request)
        emitter = emitter(self, request=request, response=content)

        # Serialize the response content
        response = emitter.emit()

        if not isinstance(response, HttpResponse):
            raise AssertionError("Emitter must return HttpResponse")

        # Append pagination headers
        if isinstance(content, Paginator):
            linked_resources = []
            if content.next_page:
                linked_resources.append('<{0}>; rel="next"'.format(
                    content.next_page))
            if content.previous_page:
                linked_resources.append(
                    '<{0}>; rel="previous"'.format(content.previous_page))
            response["Link"] = ", ".join(linked_resources)

        return response