Improve colours used for bar chart series and pie chart data points
The colours for bar chart series are not very appealing when more than two series are being plotted. The colours used for pie chart data points are generated using a routine that I have written, but it is not very elegant.
I would like to make use of a pre-written library, and think that chroma.js (http://github.com/gka/chroma.js) will work well. It will enable the use of colour scales similar to those on the ColorBrewer site (http://colorbrewer2.org/): http://github.com/gka/chroma.js/wiki/Predefined-Colors.
I have already implemented this library when working on issue
#332, but thought that it was worth having it as a separate issue.