Move EmbeddedRecordsMixin to core from activemodel

Embedded record relationships within a payload has utility even when
the backend is not ActiveModel.  Moved the mixin to the lib/serializers
dir
sorry about that.  reverted.

On Jul 31, 2014, at 7:09 PM, Stefan Penner <notifications@github.com> wrote:

> In .gitignore:
> 
> > @@ -17,3 +17,19 @@ docs/node_modules/
> >  
> >  node_modules/
> >  bower_components/
> > +
> > +.idea/.name
> is this something you can control in a global setting for your editor? We don't typically want to keep this stuff around for all possible editors
> 
> —
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