[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/2.7.x-fixes@1524481 13f79535-47bb-0310-9956-ffa450edef68
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git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/2.7.x-fixes@1524483 13f79535-47bb-0310-9956-ffa450edef68