PhantomJS: Server Side generated combined charts
PhantomJS/HighCharts at the moment supports only chart by chart server side image generation by passing options of a chart.
It would be nice that when someone passes multiple options PhantomJS and HighCharts consider this as each option as a new chart and stack them together into one image.
Only solution at the moment is that we generate one by one chart and combine them seperetly which i think should be done already on PhantomJS/HighCharts.
We're looking into it, but we have to consider the performance impact. We'll most likely add it to the CLI, and maybe even the server API, but we'll have to see about the live export server.