[gnome-shell/wip/sass] Bump version to 3.15.3

[Jakub Steiner <jimmac src gnome org>]

commit 8faf4929a6a651d8622341dadf45f398149d718f
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Dec 19 11:47:50 2014 +0100

    Bump version to 3.15.3
    
    Update NEWS.

 NEWS         |   14 ++++++++++++++
 configure.ac |    4 ++--
 2 files changed, 16 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 71f85dc..f2661e6 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,17 @@
+3.15.3
+======
+* Add support for high-contrast themes [Florian; #740447]
+* Fix banner message on login screen without user list [Ray; #703972]
+* Fix flicker when activating windows on another workspace [Florian; #741680]
+* Misc. bug fixes [Giovanni, Florian; #735308, #740237]
+
+Contributors:
+  Giovanni Campagna, Florian Müllner, Jasper St. Pierre, Ray Strode
+
+Translations:
+  Balázs Úr [hu], Josef Andersson [sv], Muhammet Kara [tr],
+  Baurzhan Muftakhidinov [kk], Inaki Larranaga Murgoitio [eu]
+
 3.15.2
 ======
 * Fix visual glitch of window preview outline in overview [Chris; #699044]
diff --git a/configure.ac b/configure.ac
index 9e4c25a..9676ab1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_PREREQ(2.63)
-AC_INIT([gnome-shell],[3.15.2],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell],[gnome-shell])
+AC_INIT([gnome-shell],[3.15.3],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell],[gnome-shell])
 
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_SRCDIR([src/shell-global.c])
@@ -76,7 +76,7 @@ AC_MSG_RESULT($enable_systemd)
 CLUTTER_MIN_VERSION=1.15.90
 GOBJECT_INTROSPECTION_MIN_VERSION=0.10.1
 GJS_MIN_VERSION=1.39.0
-MUTTER_MIN_VERSION=3.15.2
+MUTTER_MIN_VERSION=3.15.3
 GTK_MIN_VERSION=3.15.0
 GIO_MIN_VERSION=2.37.0
 LIBECAL_MIN_VERSION=3.5.3