Redirect old stats page URL to new page.

The standalone stats page was removed in 3.0 for an all-in-one config and stats page.  Redirect any links that might have been bookmarked or in browser history.


git-svn-id: https://plugins.svn.wordpress.org/akismet/trunk@873071 b8457f37-d9ea-0310-8a92-e5e31aec5664