Bug/remove renderer option

Versions >= 0.9.0 currently remove the ability to pass through any option you want, and instead has a number of [predefined options that get set](https://github.com/rails-api/active_model_serializers/blob/0-9-stable/lib/active_model/array_serializer.rb), so you can't access `@options` in the serialiser object.

I've removed the need for the template rendered option, and it just renders the view using an instance of `ActionController::Base`, which achieves the same result without the extra option.