Smooth gradientColors + new examples/shortcode_colors_demo.txt & examples/shortcode_format_demo.txt

git-svn-id: https://plugins.svn.wordpress.org/nvd3-visualisations/trunk@950074 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt update

git-svn-id: https://plugins.svn.wordpress.org/nvd3-visualisations/trunk@950077 b8457f37-d9ea-0310-8a92-e5e31aec5664