pygal

• Remove DateY and replace it by real XY datetime, date, time and timedelta support. (#188)
• Introduce new XY configuration options: xrange, x_value_formatter.
• Add show_x_labels option to remove them and the x axis.
• Set print_values to False by default.
• Fix secondary serie text values when None in data. (#192)

Add margin_top, margin_right, margin_bottom, margin_left options which defaults to margin. (thanks djt)
Update django mime parameter from mimetype to content_type. (thanks kswiat)
Allow a color and a style parameter to value metadata.