[maven-release-plugin] prepare release maven-release-2.4.2

git-svn-id: https://svn.apache.org/repos/asf/maven/release/trunk@1535101 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/maven/release/trunk@1535103 13f79535-47bb-0310-9956-ffa450edef68