Settings: Add the gtk_long_press_time property.
Gdk::Window: Add some methods.

* gdk/src/window.hg: Add get/set_event_compression(),
  set_shadow_width(), and show_window_menu().
  Some of these were actually added in GTK+ 2.12 but not yet wrapped
  in gtkmm 2.12.
ListBox: Add some methods.

* gtk/src/listbox.[hg|ccg]: Add selected_foreach(),
  get_selected_rows(), unselect_row(), select_all() and unselect_all().
ListBox: Add the selected_rows_changed() signal.

And ignore some more keybinding signals.
ListBoxRow: Add some methods and properties.

* gtk/src/listboxrow.hg:
  Add is_selected(), set/get_selectable(), set/get_activatable().
  Add the selectable and activatable properties.