Merge pull request #29 from shimmerproject/master

Fixes for GTK 3.8
Better GTK 3.6 compatibility
Merge pull request #34 from shimmerproject/master

GTK 3.8 support
Added back inset shadows in linked buttons
Merge pull request #35 from shimmerproject/master

Added back inset shadows in linked buttons
Made the ON switches green
Enable app icon and add pixmaps for background
Remove focus-line in treeview
Tweaked some colors
Change notebook styles
Change notebook styles
Fixed typos
Merge pull request #41 from shimmerproject/master

Various fixes
Merge pull request #40 from toupeira/master

Add application icon in Xfwm theme
Modifications to the pull request
Merge pull request #42 from shimmerproject/master

Modifications to Xfwm4 theme
Change focus style
Dropped support for Granite widgets
It's too complicated to make wingpanel and popovers look good. Most other granite widgets look fine in Greybird. So better to drop the additional code to reduce workload.
Updated README
Corrected wrong class names