Convert Akismet singleton to a static class for consistency among methods.


git-svn-id: https://plugins.svn.wordpress.org/akismet/trunk@875750 b8457f37-d9ea-0310-8a92-e5e31aec5664
Deprecation notices for all functions removed in 3.0. Better safe than sorry.


git-svn-id: https://plugins.svn.wordpress.org/akismet/trunk@875751 b8457f37-d9ea-0310-8a92-e5e31aec5664