[gtkmm] Created tag 3.18.0

[Murray Cumming <murrayc src gnome org>]

The unsigned tag '3.18.0' was created.

Tagger: Murray Cumming <murrayc murrayc com>
Date: Tue Sep 22 13:07:22 2015 +0200

    3.18.0

Changes since the last tag '3.17.90':

Chun-wei Fan (1):
      example_glarea.cc: Fix Build on Visual Studio 2013

Kjell Ahlstedt (3):
      TreeView, TreeViewColumn: Deprecate SlotCellData, add SlotTreeCellData
      Update .gitignore
      Gdk::Cursor, Pixbuf, Window: Fix use of Cairo::xxx in namespace Gdk

Murray Cumming (3):
      Gtk::Object: Add dont_allow_use_in_glib_refptr_ .
      C++11: gmmproc: _CLASS_GTKOBJECT(): Use = delete to make these noncopyable.
      3.18.0