[metacity] bump version to 3.18.0, update NEWS

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 84acc94c390a285af7dab9c2d34c3fc21e11968d
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Sep 23 18:02:02 2015 +0300

    bump version to 3.18.0, update NEWS

 NEWS         |   12 ++++++++++++
 configure.ac |    4 ++--
 2 files changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 8db8883..a9b3103 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,15 @@
+Version 3.18.0
+==============
+- Fix adwaita theme fallback colors. (Balló György)
+- Fix crash when using Alt-Tab to switch widnows with alt-tab-thumbnails
+  enabled. (Alberts Muktupāvels)
+- Fix visual artifacts after unmaximizing Google Chrome / Chromium
+  window. (Alberts Muktupāvels)
+- Ported away from gnome-common. (Alberts Muktupāvels)
+- Updated translations:
+  Balázs Úr (hu), Daniel Mustieles (es), Marek Černocký (cs), Piotr Drąg (pl),
+  Sveinn í Felli (is), Yosef Or Boczko (he).
+
 Version 3.17.2
 ==============
 - Don't grab keybinding if devirtualization failed. (Alberts Muktupāvels)
diff --git a/configure.ac b/configure.ac
index 38fa69a..ef68a4f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,8 +3,8 @@ dnl Define version info
 dnl **************************************************************************
 
 m4_define([m_major_version], [3])
-m4_define([m_minor_version], [17])
-m4_define([m_micro_version], [2])
+m4_define([m_minor_version], [18])
+m4_define([m_micro_version], [0])
 m4_define([m_version], [m_major_version.m_minor_version.m_micro_version])
 
 dnl **************************************************************************