graph: modify GetDependants to accept list of successful and failed jobs

cc @josephschorr
sorry, I can't seem to spell today

On Mon Nov 24 2014 at 7:30:20 PM josephschorr <notifications@github.com>
wrote:

> In graph.go:
>
> > @@ -41,29 +41,39 @@ func (g *Graph) Validate() bool {
> >  	return true
> >  }
> >
> > -// GetDependants returns all dependant jobs for the given jobs. Note
> > +// GetDependants returns all dependant jobs for the given jobs. The
> > +// jubs should be passed with the first argument being a list of
> > +// succesfful jobs and the second being a list of fialed job. Note
>
> fialed -> failed
>
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> <https://github.com/sylphon/graph-builder/pull/15/files#r20837410>.
>