Change test to use single file Plottable.js.
Change test to use single file Plottable.js.

Close #1091.

danmane/plottable,palantir/plottable,onaio/plottable,NextTuesday/plottable,RobertoMalatesta/plottable,onaio/plottable,RobertoMalatesta/plottable,RobertoMalatesta/plottable,gdseller/plottable,softwords/plottable,jacqt/plottable,alyssaq/plottable,softwords/plottable,alyssaq/plottable,softwords/plottable,danmane/plottable,gdseller/plottable,onaio/plottable,NextTuesday/plottable,palantir/plottable,palantir/plottable,gdseller/plottable,iobeam/plottable,iobeam/plottable,jacqt/plottable,iobeam/plottable,alyssaq/plottable,NextTuesday/plottable,palantir/plottable,jacqt/plottable,danmane/plottable