[maven-release-plugin] prepare release tomcat-maven-plugin-2.1

git-svn-id: https://svn.apache.org/repos/asf/tomcat/maven-plugin/trunk@1448416 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/tomcat/maven-plugin/trunk@1448418 13f79535-47bb-0310-9956-ffa450edef68