Adding examples for new charts and configurations to showcase.
Merge pull request #11 from eXist-db/feature/add-new-examples-for-charts-and-configuration-to-showcase

Adding examples for new charts and configurations to showcase.
Allow configuration of MultiplePiePlot and avoid NPE in setSectionColors() if plot is MultiplePiePlot. Method setSectionColors() taking values, key *and* colour, from <sectionColors> does not work as expected I would say, so need to think about that and add a solution later.
Merge pull request #12 from ljo/feature/avoid-npe-multiple-pie-plot

Allow configuration of MultiplePiePlot and avoid NPE in setSectionColors...
Adding PiePlotDrawingSupplier to be able to use sectionColors with MultiplePiePlot. Also fixed setting the background paint of the subplots.
Merge pull request #13 from ljo/feature/avoid-npe-multiple-pie-plot

Adding PiePlotDrawingSupplier to be able to use sectionColors with Multi...