Fix:Ticket 116:Added new icon from nekohayo and a .desktop file. Tested under kde.

[navit-package] / navit / xpm / desktop_icons / navit.desktop

[Desktop Entry]
Version=1.0
Encoding=UTF-8
Name=Navit
Comment=The open source vector based navigation program with routing engine
Exec=navit
Icon=navit
StartupNotify=true
Terminal=false
Type=Application
Categories=GTK;Utility;
GenericName=Navit