Project mavenization

This is a mavenization of the project:
* use the maven standard directory layout + maven convention + maven dependencies...
* use maven assembly plugin in order to generate the zip distribution (mvn assembly:single)
* the ant build process still work:
     * use the maven standard directory layout
     * the dependencies resolution can be improve by using ivy for instance. For information, the dumbster1.6.jar lib is not necessary (could be removed)
     * improve zip distribution (include doc directory)

Thanks Matteo for sharing this exercise.