[mutter] Bump version to 3.15.1

[Florian Müllner <fmuellner src gnome org>]

commit 63e31af47681241d0905bcfeaef47b272fb901d3
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Oct 30 10:24:07 2014 +0000

    Bump version to 3.15.1
    
    Update NEWS.

 NEWS         |   12 ++++++++++++
 configure.ac |    2 +-
 2 files changed, 13 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 38c4dd5..e67e0d3 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,15 @@
+3.15.1
+======
+* Use GResources for theme loading [Cosimo; #736936]
+* Fix headerbar drag getting stuck on xwayland [Carlos; #738411]
+* Fix wayland hiDPI regressions [Adel; #739161]
+* Misc bug fixes and cleanups [Jasper, Rui, Carlos; #662962, #738630, #738888,
+  #738890]
+
+Contributors:
+  Cosimo Cecchi, Adel Gadllah, Carlos Garnacho, Rui Matos, Florian Müllner,
+  Jasper St. Pierre
+
 3.14.1
 ======
 * Fix move-titlebar-onscreen function [Florian; #736915]
diff --git a/configure.ac b/configure.ac
index 25d822a..685784e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 AC_PREREQ(2.62)
 
 m4_define([mutter_major_version], [3])
-m4_define([mutter_minor_version], [14])
+m4_define([mutter_minor_version], [15])
 m4_define([mutter_micro_version], [1])
 
 m4_define([mutter_version],