Created comparison chart and table-based stacked area chart. Updated pie labels. 

* Add 'chartLabels' to options.chartLabels
* Add 'logger()' function to turn console.logs on/off for debugging
* Removing extraneous console.logs
* Create a comparison chart
* Can Pie charts fall back to table graphic when there's no SVG? (Works well for 2-value charts)
* Pie Chart values are lost in smaller wedges. 
* Added options.donutLabelTag for a smaller label under options.donutLabel
* Added options.donutLabel for a large number label in the center of the Donut Hole.
* Added options.labelSlices (default true) so that you can turn off the numbers for the slices.
* Removed any prefix/suffix characters from the source table (£ € $ % ¢)
* Automatically size the labels for tableBarChart() If the width is hardcoded, it breaks.