refactor to add modules for jungrapht-visualization

[tomnelson]

This pull request adds new modules that use jungrapht-visualization and JGraphT instead of Jung. I think you will like the new layout algorithms: TidierTree, Sugiyama, Circle that minimizes edge crossings, etc. I believe you have an audience that would appreciate your library using these updates. Also, if you would like to deploy to maven central instead of your own repo, I would be happy to help.

[florecista]

I'm keen for this update. I'm using VL-Jung on my own little project.