Updates for GTK 3.16

README

gtk-2.0/apps/xfce-panel.rc

gtk-2.0/gtkrc

gtk-3.0/apps/gnome-applications.css

gtk-3.0/apps/granite-widgets.css

gtk-3.0/apps/lightdm-gtk-greeter.css

gtk-3.0/apps/lightdm-unity-greeter.css

gtk-3.0/apps/unity.css

gtk-3.0/apps/xfce.css

gtk-3.0/assets/checkbox-checked-hover.png

gtk-3.0/assets/checkbox-checked-insensitive.png

gtk-3.0/assets/checkbox-checked.png

gtk-3.0/assets/checkbox-mixed-hover.png

gtk-3.0/assets/checkbox-mixed-insensitive.png

gtk-3.0/assets/checkbox-mixed.png

gtk-3.0/assets/checkbox-unchecked-insensitive.png

gtk-3.0/assets/checkbox-unchecked.png

gtk-3.0/assets/radio-mixed-hover.png

gtk-3.0/assets/radio-mixed-insensitive.png

gtk-3.0/assets/radio-mixed.png