How do I add a bar chart? The documentation is very inconsistent, it doesn't look like it's possible to add a barchart w/ the example code, is this correct? `slide.addBarChart(
{ title: 'Sample bar chart',
data: [ // each item is one serie
{
name: 'europe',
labels: ['Y2003', 'Y2004', 'Y2005'],
values: [2.5, 2.6, 2.8],
color: 'ff0000' // optional
},
{
name: 'namerica',
labels: ['Y2003', 'Y2004', 'Y2005'],
values: [2.5, 2.7, 2.9],
color: '00ff00' // optional
},
{
name: 'asia',
labels: ['Y2003', 'Y2004', 'Y2005'],
values: [2.1, 2.2, 2.4],
color: '0000ff' // optional
},
{
name: 'lamerica',
labels: ['Y2003', 'Y2004', 'Y2005'],
values: [0.3, 0.3, 0.3],
color: 'ffff00' // optional
},
{
name: 'meast',
labels: ['Y2003', 'Y2004', 'Y2005'],
values: [0.2, 0.3, 0.3],
color: 'ff00ff' // optional
},
{
name: 'africa',
labels: ['Y2003', 'Y2004', 'Y2005'],
values: [0.1, 0.1, 0.1],
color: '00ffff' // optional
}
);`