* Changed hook which is used for search engine pings

git-svn-id: https://plugins.svn.wordpress.org/google-sitemap-generator/trunk@937300 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Readme content

git-svn-id: https://plugins.svn.wordpress.org/google-sitemap-generator/trunk@937301 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Updated documentation

git-svn-id: https://plugins.svn.wordpress.org/google-sitemap-generator/trunk@937302 b8457f37-d9ea-0310-8a92-e5e31aec5664