SLING-2779 :  Support for default properties values of a resource. Apply modified patch from Gilles Knobloch - I'Ve simplified the values(), keySet(), entrySet() methods and moved the CompositeValueMap into the wrappers package. I also dropped the util class completely

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1519608 13f79535-47bb-0310-9956-ffa450edef68