Use released Sling API

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1620839 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare release org.apache.sling.jcr.resource-2.3.8

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1620840 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1620842 13f79535-47bb-0310-9956-ffa450edef68
Use latest API snapshot during release

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1620843 13f79535-47bb-0310-9956-ffa450edef68
Use latest API snapshot during release

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1620844 13f79535-47bb-0310-9956-ffa450edef68
Use latest API snapshot during release

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1620845 13f79535-47bb-0310-9956-ffa450edef68
Use latest API snapshot during release

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1620846 13f79535-47bb-0310-9956-ffa450edef68