[mutter] Bump version to 3.13.91

[Florian Müllner <fmuellner src gnome org>]

commit 4b260d5d9f4683ae47db6412af94c5a73e4c2053
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Sep 3 14:03:16 2014 +0200

    Bump version to 3.13.91
    
    Update NEWS

 NEWS         |   13 +++++++++++++
 configure.ac |    2 +-
 2 files changed, 14 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 8672d40..ea8b1f2 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,16 @@
+3.13.91
+=======
+* Misc. bug fixes [Carlos; #735452]
+
+Contributors:
+  Adel Gadllah, Carlos Garnacho, Rui Matos, Jasper St. Pierre,
+  Rico Tzschichholz
+
+Translations:
+  Chao-Hsiung Liao po/zh_HK, zh_TW.po, Enrico Nicoletto [pt_BR],
+  Kjartan Maraas [nb], Fran Diéguez [gl], Yosef Or Boczko [he],
+  Maria  Mavridou [el], Claude Paroz [fr]
+
 3.13.90
 =======
 * Only call XSync() once per frame [Rui; #728464]
diff --git a/configure.ac b/configure.ac
index d7f66d8..094a055 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@ AC_PREREQ(2.62)
 
 m4_define([mutter_major_version], [3])
 m4_define([mutter_minor_version], [13])
-m4_define([mutter_micro_version], [90])
+m4_define([mutter_micro_version], [91])
 
 m4_define([mutter_version],
           [mutter_major_version.mutter_minor_version.mutter_micro_version])