Grouped bar chart #147
Description
Is it possible to show an grouped bar chart? E.g. https://camo.githubusercontent.com/4e8f9da445e01bdd5fb7f03866b9b765e1ac546c09d76bf102b9772d1094ab15/68747470733a2f2f7261772e6769746875622e636f6d2f5068696c4a61792f4d5043686172742f6d61737465722f73637265656e73686f74732f67726f7570656462617263686172742e706e67