Using maven-release-plugin and maven-scm-plugin to tag all submodules of a multimodule project

I just created a sample multi module maven project in which by using the maven-release-plugin and the maven-scm-plugin I achieved my goal to create additional tags for the module artifacts as well. For a rationale see the included README.

There are two branches, one working with git and one with Subversion (in the master branch).