Kozea/pygal — pull request #126 by sirlark (2014-05-15 10:06:14+00:00)
Title: Adds tests for plot_boject.add_xml_filters

Adds two tests for the add_xml_filters method of a plot object, a round
trip of a non-tree-modifying filter, and a simple tree modifcation that
adds a sub-plot of change bars to a bar plot.