[maven-release-plugin] prepare release kalumet-0.6-incubating

git-svn-id: https://svn.apache.org/repos/asf/incubator/kalumet/branches/0.6.x@1520234 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/incubator/kalumet/branches/0.6.x@1520236 13f79535-47bb-0310-9956-ffa450edef68