Use released Sling API

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1561216 13f79535-47bb-0310-9956-ffa450edef68
Use released Sling API

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1561217 13f79535-47bb-0310-9956-ffa450edef68