3.0.4
   * Support system wide themes (bug 648751)
   * Fix duplicate themes (bug 649687)
   * A theming specification for shell themes has been developed and agreed upon
     by a number of theme authors. If installing a theme matching this specification
     show the appropriate name
     http://www.fpmurphy.com/public/gnome_theme_packaging_spec_d2.txt
   * Support management of Shell extensions (in home directory)