javafx 同时画line chart和bar chart

简化代码在：

http://stackoverflow.com/questions/28788117/stacking-charts-in-javafx

详细代码在：

https://gist.github.com/jewelsea/3668862

双Y坐标的linechart：

https://blog.jj-it-services.de/en/javafx-linechart-multiple-y-axis/