add public functions for diplaying statistics 

git-svn-id: https://plugins.svn.wordpress.org/author-and-post-statistic-widgets/trunk@1010808 b8457f37-d9ea-0310-8a92-e5e31aec5664
change plugin version to 1.3.0

git-svn-id: https://plugins.svn.wordpress.org/author-and-post-statistic-widgets/trunk@1010809 b8457f37-d9ea-0310-8a92-e5e31aec5664