[gnome-tweak-tool] Install shell.css

[John Stowers <jstowers src gnome org>]

commit c8eb9317aa2b8529bb9834043024e0163aa676df
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Mon Aug 19 00:44:13 2013 +0200

    Install shell.css
    
    Without that, gnome-tweak-tool doesn't start
    
    https://bugzilla.gnome.org/show_bug.cgi?id=706274

 data/Makefile.am |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/data/Makefile.am b/data/Makefile.am
index 354a3a3..4b1a08d 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -2,7 +2,8 @@ SUBDIRS = icons
 
 guidir = $(pkgdatadir)
 gui_DATA = \
-        shell.ui
+        shell.ui \
+       shell.css
 
 desktop_in_files = gnome-tweak-tool.desktop.in
 desktopdir = $(datadir)/applications