[gnome-themes-standard] Created tag 3.1.91

[Cosimo Cecchi <cosimoc src gnome org>]

The signed tag '3.1.91' was created.

Tagger: Cosimo Cecchi <cosimoc gnome org>
Date: Tue Sep 6 15:16:56 2011 -0400

    Release 3.1.91

Changes since the last tag '3.1.90':

Cosimo Cecchi (7):
      menuitem: make the insensitive text color a bit darker
      adwaita: remove our custom gtk_render_line() implementation
      separator: correctly set the color for tree view separators
      slider: ensure we don't render a line on the slider
      pathbar: apply a linked style to the filechooser pathbar buttons
      build: bump GTK+ required version
      release: prepare for 3.1.91