Add Build watch support

Don't add new wrong code


> On Oct 30, 2014, at 9:43 AM, Dan Mace <notifications@github.com> wrote:
> 
> In pkg/build/registry/build/rest.go:
> 
> > @@ -98,3 +99,15 @@ func (r *REST) Update(ctx kubeapi.Context, obj runtime.Object) (<-chan runtime.O
> >  		return build, nil
> >  	}), nil
> >  }
> > +
> > +// Watch begins watching for new, changed, or deleted Builds.
> > +func (s *REST) Watch(ctx kubeapi.Context, label, field labels.Selector, resourceVersion string) (watch.Interface, error) {
> > +	return s.registry.WatchBuilds(resourceVersion, func(build *api.Build) bool {
> Now I see, and agree, but can we address this issue generally.uniformly in another PR? I don't think it's worth stonewalling this piece of functionality since it's at least internally consistent.
> 
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