Merge pull request #248 from msteiger/2.0

Update URLs to terasology.org
fixed invalid folder in DirectoryChooser dialog
- fixes #426 and solves #425
fixed NPE when loading About tab
Merge pull request #249 from skaldarnar/2.0

folder selection and NPE in About tab
fixed copyExtra location
Merge pull request #251 from skaldarnar/2.0

fixed copyExtra location
Added window title and icons