Bump 3.23.91.1 release

NEWS

@@ -1,3 +1,7 @@
+Major changes in 3.23.91.1:
+* Fix compiler flags
+* Add the co-maintainer to the DOAP file
+
 Major changes in 3.23.91:
 * Minor bugfixes
 * Updated translations for:

configure.ac

@@ -1,6 +1,6 @@
 dnl -*- mode: m4 -*-
 AC_PREREQ([2.69])
-AC_INIT([gnome-calendar],[3.23.91],[http://bugzilla.gnome.org/enter_bug.cgi?product=gnome-calendar],[gnome-calendar],[https://wiki.gnome.org/Apps/Calendar])
+AC_INIT([gnome-calendar],[3.23.91.1],[http://bugzilla.gnome.org/enter_bug.cgi?product=gnome-calendar],[gnome-calendar],[https://wiki.gnome.org/Apps/Calendar])
 
 AX_IS_RELEASE([minor-version])
 
@@ -73,8 +73,6 @@ dnl Misc
 dnl ================================================================
 AC_PATH_PROG([GLIB_MKENUMS], [glib-mkenums])
 
-AX_COMPILER_FLAGS
-
 GLIB_MIN_VERSION=2.43.4
 GTK_MIN_VERSION=3.21.6
 ECAL_REQUIRED=3.13.90

data/appdata/org.gnome.Calendar.appdata.xml.in

@@ -42,6 +42,16 @@
   <project_group>GNOME</project_group>
 
   <releases>
+    <release date="2017-02-28" version="3.23.91.1">
+      <description>
+        <p>
+          In this release, a couple of minor bugs were fixed. GNOME Calendar is
+          gaining stability fixes until the next stable release now.
+        </p>
+        <p>Thanks to all the contributors that worked on GNOME Calendar!</p>
+      </description>
+    </release>
+
     <release date="2017-02-27" version="3.23.91">
       <description>
         <p>