Merge pull request #29 from shimmerproject/master

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

GTK 3.8 support
Merge pull request #35 from shimmerproject/master

Added back inset shadows in linked buttons
Enable app icon and add pixmaps for background
Merge pull request #41 from shimmerproject/master

Various fixes
Merge pull request #40 from toupeira/master

Add application icon in Xfwm theme