Add documentation, update links for 4.4.0

Change-Id: Ibb93f7ba80b7a065ea83660fc75be9b065138ad9
Reviewed-on: http://gerrit.cloudera.org:8080/21311
Reviewed-by: Zoltan Borok-Nagy <boroknagyz@cloudera.com>
Tested-by: Zoltan Borok-Nagy <boroknagyz@cloudera.com>
583 files changed