Fork of Active Model Serializers

I hate RABL, I love AMS. Unfortunately I have to support XML.

There is a [fork](https://github.com/jokklan/active_model_serializers/tree/features/xml-support) of AMS that adds XML support, it is not nearly done and quite buggy but AMS in general is under very active development and I still prefer using this to RABL. 

Maybe the XML support will get stable, otherwise I might just drop it in the future.