Removed obsolete ImageUtils class.
Updated GameJob.
- don't show TerasologyLegacy by default anymore (only installed versions)
- updated minimal versions w.r.t. to the latest changes + server crash
Fixed missing change listeners in settings dialog.
Updated Checkstyle settings and fixed some Checkstyle issues.

I think we agreed on not using the @author as the git history does a way better job.
Removed unwanted license header.
Merge pull request #293 from skaldarnar/javafx_cleanup

Javafx cleanup