[mutter] Bump version to 3.15.90

[Florian Müllner <fmuellner src gnome org>]

commit c215247a6ca6c1de391c5b1961d14c2201ed950d
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Feb 20 18:16:34 2015 +0100

    Bump version to 3.15.90
    
    Update NEWS.

 NEWS         |   18 ++++++++++++++++++
 configure.ac |    2 +-
 2 files changed, 19 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index c3b35f2..093df9f 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,21 @@
+3.15.90
+=======
+* Initialize MetaOutput even when we can't get the EDID [Rui; #743412]
+* Expose MetaMonitorManager to introspection [Rui; #743745]
+* Fix flash on unredirection [Chris; #743858]
+* Update xdg-shell implementation to v5 [Jonas; #744452]
+* Do not try to use seat devices that aren't (yet) present [Ray; #744640]
+* Add keybindings for switching to VT8-VT12 [Ray; #744800]
+* Misc bug fixes [Jonas, Cosimo; #743678, #744500]
+
+Contributors:
+  Jonas Ådahl, Cosimo Cecchi, Carlos Garnacho, Rui Matos, Jasper St. Pierre,
+  Ray Strode, Chris Wilson
+
+Translations:
+  Yosef Or Boczko [he], Yuri Myasoedov [ru], Kristjan SCHMIDT [eo],
+  Matej Urbančič [sl], Dušan Kazik [sk]
+
 3.15.4
 ======
 * Use GTK+ theme for window decorations instead of metacity [Florian; #741917]
diff --git a/configure.ac b/configure.ac
index 25ddf33..71394e1 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], [15])
-m4_define([mutter_micro_version], [4])
+m4_define([mutter_micro_version], [90])
 
 m4_define([mutter_version],
           [mutter_major_version.mutter_minor_version.mutter_micro_version])