2.5.4:

Gtk:
* Action: Added get_accel_path(). (Murray Cumming)
* CellRendererText: Added language, ellipsize, and 
  ellipsize-set properties. (Bryan Forbes)
* TreeView: Added hover_expand and hover_selection 
  properties.

Gdk:
* Display: Added supports_selection_notification(), 
  request_selection_notification(), supports_clipboard_persistance(), 
  store_clipboard().
* Pixbuf: Added rotate_simple(), flip(), save_to_buffer().
* PixbufFormat: Added is_scalable(), is_disabled(), 
  set_disabled(), get_license().
* Window: Added enable_synchronized_configure(), 
  configure_finished(), set_focus_on_map().

Atk:
* Relation: Added add_target().
* RelationSet.hg: add_relation_by_type().
* Text: Added get_range_extents(), get_bounded_ranges().
  (Murray Cumming)