add google analytics

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1541304 13f79535-47bb-0310-9956-ffa450edef68
add privacy policy page

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1541305 13f79535-47bb-0310-9956-ffa450edef68
fix date

git-svn-id: https://svn.apache.org/repos/asf/incubator/sirona/trunk@1541306 13f79535-47bb-0310-9956-ffa450edef68