* Don't gzip if behind Varnish
* Improved compatibility with caches
* Ping on post edit

git-svn-id: https://plugins.svn.wordpress.org/google-sitemap-generator/trunk@925789 b8457f37-d9ea-0310-8a92-e5e31aec5664
* Updated documentation

git-svn-id: https://plugins.svn.wordpress.org/google-sitemap-generator/trunk@925791 b8457f37-d9ea-0310-8a92-e5e31aec5664