Mixin over inheritance

[mgomes]

Cool gem! Have you considered switching shale to be included within a class rather than inheriting from Shale::Mapper? I think shale would have better interoperability with ActiveRecord models, for example, if that were the case.

[kgiszczak]

You can achieve the same results using custom models https://github.com/kgiszczak/shale#using-custom-models