There is now a way to allow gaps in charts due to missing
measurements. A style setting (StrokeMaxSpanGap) determines
whether a gap is stroked or not.
An example is included in examples/custom_styles.
* Add stacked bar chart value labels (#60)
* Add horizontal render option to stacked bar chart (#39)
* Pulling 100% inside the canvasBox to remain visible.
* Use correct margins for YAxis.TextHorizontalAlign: chart.TextHorizontalAlignRight
* Fixed Show to Hidden due to 5f42a580a9
* works more or less
* updating comment
* removing debugging printf
* adding output
* tweaks
* missed a couple series validations
* testing auto coloring
* updated output.png
* color tests etc.
* sanity check tests.
* should not use unkeyed fields anyway.
