Log Message:
Update ruby-gnome2 to 2.2.4.

It is a x64 Windows support release.

=== Changes

==== Ruby/GLib2

  * Improvements
    * Stopped to call g_thread_init() for GLib 2.32.0 or later because
      g_thread_init() is called automatically.
    * Added GLib.format_size.
    * Added GLib::Source#name.
    * Added GLib::Source#name=.
    * Added GLib::Source#ready_time.
    * Added GLib::Source#ready_time=.
    * Added GLib::Source#destroy.
  * Fixes
    * Fixed a bug that wrong converter is used on bigendian
      environment.
      [GitHub#270][Reported by mtasaka]

==== Ruby/GIO2

  * Improvements
    * Added Gio::DBus.
  * Fixes
    * Fixed a bug that Gio::ContentType#executable? isn't defined by
      correct name.

==== Ruby/GTK2

  * Improvements
    * Gtk::AboutDialog#show: Supported license_type option.
      [ruby-gnome2-devel-ja][Patch by Hiroyuki Ito]
  * Fixes
    * Gtk::AboutDialog#show: Fixed a bug that wrap_license option
      doesn't work.
      [ruby-gnome2-devel-ja][Patch by Hiroyuki Ito]

==== Ruby/GObjectIntrospection

  * Improvements
    * Supported prefix removing from method name.
    * Supported GList of UTF-8.
      [ruby-gnome2-devel-en][Reported by Detlef Reichl]
    * Added documentation.
      [GitHub#267][Patch by Detlef Reichl]
  * Fixes
    * Fixed a bug that out only argument is required.
      [GitHub#268][Reported by mtasaka]

==== Ruby/GDK3

  * Improvements
    * Gdk::Window: Added deprecated constants for backward compatibility.
    * Supported Gdk::Keyval module functions.
      [GitHub#265][Reported by Detlef Reichl]
    * Cairo::Context#set_source_rgba: Re-supported
      (({set_source_rgba(r, g, b, a)})) style.
      [GitHub#272][Patch by Detlef Reichl]
    * [windows] Bundled the new default GNOME icon theme.
      [GitHub#276][Reported by glurp]
  * Fixes
    * Gdk::Color.parse: Fixed unexpected API change.
      [GitHub#276][Reported by glurp]
    * Fixed a bug that Gdk::Event::Mask fallback doesn't work.
      [GitHub#276][Reported by glurp]

==== Ruby/GTK3

  * Improvements
    * Gtk::AboutDialog#show: Supported license_type option.
      [ruby-gnome2-devel-ja][Patch by Hiroyuki Ito]
    * Gtk::ActionBar: Added.
      [GitHub#282][Suggested by Christopher L. Ramsey]
  * Fixes
    * Gtk::AboutDialog#show: Fixed a bug that wrap_license option
      doesn't work.
      [ruby-gnome2-devel-ja][Patch by Hiroyuki Ito]

==== Ruby/RSVG2

  * Improvements
    * RSVG::Handle.new_from_file: Supported flags. You can open a
      large file with (({:flags => :unlimited})).
      [GitHub#263][Patch by Taro Matsuzawa]

==== Ruby/Clutter

  * Improvements
    * Added Clutter::Feature.
  * Fixes
    * Added missing require for Ruby/Pango.
    * Fixed initializing order.
      [GitHub#274][Reported by mtasaka]

=== Thanks

  * Detlef Reichl
  * Hiroyuki Ito
  * mtasaka
  * glurp
  * Taro Matsuzawa
  * Christopher L. Ramsey