xy-plot and time-series-plot modified to take into account group-by names correctly for legend labels. Fixes incanter/incanter#216
xy-plot and time-series-plot modified to take into account group-by
names correctly for legend labels. Fixes liebke/incanter#216
Merge branch 'master' of https://github.com/tranchis/incanter
Merge pull request #217 from tranchis/master

xy-plot and time-series-plot modified to take into account group-by names correctly for legend labels.