- First set of commits to support historical values after purging data.

git-svn-id: https://plugins.svn.wordpress.org/wp-statistics/trunk@1010769 b8457f37-d9ea-0310-8a92-e5e31aec5664
- Updated readme.

git-svn-id: https://plugins.svn.wordpress.org/wp-statistics/trunk@1010773 b8457f37-d9ea-0310-8a92-e5e31aec5664