[gnome-shell-extensions] Bump version to 3.15.91

[Florian Müllner <fmuellner src gnome org>]

commit 44cbe64e30b1500b7c52b1295b9fb98facdf946e
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Mar 5 17:43:10 2015 +0100

    Bump version to 3.15.91
    
    To go along GNOME Shell 3.15.91.

 NEWS         |    8 ++++++++
 configure.ac |    2 +-
 2 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 4f3f17e..ae4e435 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,11 @@
+3.15.91
+=======
+* classic: Update theme
+* systemMonitor extension was removed, as the message tray where it
+  put its indicator no longer exists
+* window-list: Adjust for gnome-shell changes
+* updated translations (gl, it, kk, ko, lt, pl, sk, uk, zh_TW)
+
 3.15.90
 =======
 * classic: Visual refresh based on new shell theme
diff --git a/configure.ac b/configure.ac
index b40114e..e3b8c6c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_PREREQ(2.63)
-AC_INIT([gnome-shell-extensions],[3.15.90],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell&component=extensions])
+AC_INIT([gnome-shell-extensions],[3.15.91],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell&component=extensions])
 
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR([config])