You need to include it as a plugin in your pom as mentioned in the how to document, and you need to provide a repository from which it can be downloaded. Because codehaus has not yet accepted this plugin, you need to add this repository to your pom.
<pluginRepositories>
<pluginRepository>
<id>tlc</id>
<name>TLC Repository</name>
<url>http://commons.ucalgary.ca/pub/m2</url>
</pluginRepository>
</pluginRepositories>