Try g.attributes_.getForSeries("stepPlot", e.setName);

We don't want private things to leak outside Dygraphs, and we really shouldn't let them leak from object to object either, but for now we're letting g.attributes_ leak outside. (Dan, is that OK here?)

Please see http://dygraphs.com/changes.html, which describes lint and testing. (I have to update the testing doc since there are easier ways to run tests now.)