Chart sizing

[jwagsters]

I'm generating a large number of charts but the default size is not big enought to read so I have to resize them all by hand. It would be fantastic to be able to set the width and height of the chart, either on creation or afterwards - or preferably both. Apart from saving time, it is very hard to get them all exactly the same size manually, so they tend to jump around when switching through tabs with identical charts.

Amazing lib btw.