SLING-3027 use latest releases (Sling Auth Core, Sling Engine, Sling Resource Resolver, Sling Discovery API, Sling Discovery Impl, Sling Event, Sling JCR Resource, Sling Scripting JSP, Sling Servlets Resolver)

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1639874 13f79535-47bb-0310-9956-ffa450edef68