POM cosmetics
Added module explanation and documentation

Wiki-pages are not yet online..
Added Liquibase XSD reference

In case someone wants to verify.
Referenced version from parent

The latest superpom version includes specific versions for several
dependencies and plugins. These must be used in all projects to ensure
knowledge transfer and code re-use.
Cleanups

Changed reference from junit.framework.Assert to new org.junit.Assert &
final
POM cleanup

Added license header and others