[maven-release-plugin] prepare release odftoolkit-0.6.1-incubating-RC3

git-svn-id: https://svn.apache.org/repos/asf/incubator/odf/trunk@1507252 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/incubator/odf/trunk@1507254 13f79535-47bb-0310-9956-ffa450edef68