Update to 3.0.4
    Dropped redundant commented out lines in spec
    Updated description
    Dropped defattr since it is set by default in recent RPM
    http://ftp.gnome.org/pub/GNOME/sources/gnome-tweak-tool/3.0/gnome-tweak-tool-3.0.4.news
    * Enables support for system wide themes
    * Supports management of shell extensions