yelp: add 3.12 version
gnome-session: add 3.12.1 version
gnome-shell: add 3.12.2 version
gnome-common: add 3.12.0 version
gnome-desktop: add 3.12.2 version
gnome-screenshot: add 3.12.0 version
gnome-system-monitor: add 3.12.2 version and cleanup expr
gnome-calculator: add 3.12.1 version and cleanup expr
gnome-icon-theme-symbolic: add 3.12.0 version
gnome-backgrounds: add 3.12.2 version
gnome-contacts: add 3.12.0 version and cleanup expr
gnome-user-docs: add 3.12.1 version
gnome-terminal: add 3.12.2 version
gnome-disk-utility: add 3.12.1 version and cleanup expr
gnome-shell-extensions: add 3.12.2 version
gnome-themes-standard: add 3.12.0 version
gnome-control-center: add 3.12.1 version and cleanup expr
gnome-online-accounts: add 3.12.2 version
gnome-online-miners: add 3.12.0 version
gnome-settings-daemon: add 3.12.2 and cleanup expr