New code for building caches. The cache is not build on first page load anymore. You have to click on "Rebuild cache" or "Save settings" to trigger cache building. Otherwise the product pages stay empty.

git-svn-id: https://plugins.svn.wordpress.org/wp-spreadplugin/trunk@936702 b8457f37-d9ea-0310-8a92-e5e31aec5664