added license header

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1595624 13f79535-47bb-0310-9956-ffa450edef68
code simplification

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1595666 13f79535-47bb-0310-9956-ffa450edef68
misc enhancements

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1595674 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare release maven-scm-publish-plugin-1.1

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1595678 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1595680 13f79535-47bb-0310-9956-ffa450edef68