[maven-release-plugin] prepare release mahout-0.9

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1560536 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1560538 13f79535-47bb-0310-9956-ffa450edef68