Use released Sling API 2.7.0

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1580836 13f79535-47bb-0310-9956-ffa450edef68
Use released Sling API 2.7.0

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1580837 13f79535-47bb-0310-9956-ffa450edef68
Use released Sling API 2.7.0 and JCR Resource 2.3.6

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1580838 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare release sling-19

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1580842 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1580844 13f79535-47bb-0310-9956-ffa450edef68