Assign and List directive fixes and tests

You are right, {{sourcepath="/home/ppalaga/bin/freemarker/freemarker-2.3.18-sources.jar"}} needs to be removed.

With maven you mean something like this? https://github.com/ppalaga/jbosstools-base/blob/master/stacks/plugins/org.jboss.tools.stacks.core/pom.xml#L25