3.3.18:

* Remove Table and other deprecated classes.
  (Kjell Ahlstedt)
* Use and mention Gtk::Application instead of Gtk::Main.
* Use Gtk::ApplicationWindow.
* Use ColorChooserDialog instead of deprecated ColorSelectionDialog.
  (Murray Cumming)
* Keyboard Events chapter: Clarify keyboard event propagation.
  (Pedro Ferreira) Bug #661857
* New example programs in the DrawingArea chapter.
  (Pedro Ferreira) Bug #666885