Update UPGRADING file for API changes. Add one for GadgetSite getActiveGadgetHolder to getActiveSiteHolder
Update UPGRADING file for API changes. Add one for GadgetSite getActiveGadgetHolder to getActiveSiteHolder

git-svn-id: 84334937b86421baa0e582c4ab1a9d358324cbeb@1382113 13f79535-47bb-0310-9956-ffa450edef68

apache/shindig,apache/shindig,apache/shindig,apache/shindig,apache/shindig