springifying the cassandra repository layer

git-svn-id: https://svn.apache.org/repos/asf/incubator/streams/trunk@1526301 13f79535-47bb-0310-9956-ffa450edef68
Applying a patch from Carol Hansen

git-svn-id: https://svn.apache.org/repos/asf/incubator/streams/trunk@1529843 13f79535-47bb-0310-9956-ffa450edef68
committing a patch from Carol Hansen

git-svn-id: https://svn.apache.org/repos/asf/incubator/streams/trunk@1535100 13f79535-47bb-0310-9956-ffa450edef68
Merged trunk