[WIP] Add support for applying a Config with set of resources via kubectl

Discussion: https://github.com/GoogleCloudPlatform/kubernetes/issues/1905
I've started to fix this in kubectl with #2000 - there are some issues we still have to sort with to allow effective transformation of unknown API objects in memory, so until we have a good solution for that this can wait (and then when we have this, it's easy).

----- Original Message -----
> > @@ -0,0 +1,101 @@
> > +{
> > +  "id": "guestbook",
> > +  "kind": "Config",
> > +  "name": "guestbook",
> > +  "description": "A simple guestbook application configuration",
> > +  "items": [
> > +    {
> > +      "apiVersion": "v1beta1",
> 
> @VojtechVitek you don't override anything. If the Config.item do not specify
> the apiVersion, the it will default to Config. Anyway, this can be added
> later.
> 
> ---
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> https://github.com/GoogleCloudPlatform/kubernetes/pull/1958/files#r19406231