Add node status to API object.

@smarterclayton @lavalamp I'm not sure if this is enough to get it work.  Beat me up.  

 @smarterclayton Should I also take care of v1beta3?

I would assume whoever does the internal refactor should clean it up.

----- Original Message -----
> > @@ -576,6 +594,8 @@ type Minion struct {
> >  	HostIP string `json:"hostIP,omitempty" yaml:"hostIP,omitempty"`
> >  	// Resources available on the node
> >  	NodeResources NodeResources `json:"resources,omitempty"
> >  	yaml:"resources,omitempty"`
> > +	// Status describes the current status of a Node
> > +	Status NodeStatus `json:"status,omitempty" yaml:"status,omitempty""`
> 
> Thanks!
> 
> Is there any particular reason we still leave the NodeResources here?  Or
> it's just not cleaned up yet?
> 
> ---
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> https://github.com/GoogleCloudPlatform/kubernetes/pull/2315/files#r20271948