2.5.3:

* Builds against the final GTK+ 2.6 API.

Gtk:
* CellRenderer.hg: Added stop_editing() which replaces the 
  now-deprecated editing_cancelled().
* CellView: Inherit from CellLayout. Removed set_value(). 
  Added convenience constructors.
* FileChooserButton.hg: Added action parameters to constructors. 
* IconView: Added get/set_columns(), get/set_item_width(),
  get/set_spacing(), get/set_row_spacing(), get/set_column_spacing(), 
  get/set_margin().
* Label: Added get/set_max_chars_width(), and property.
* TextView: Added get_iter_at_position().

Gdk:
* Pixbuf: Added create_from_file() overload that takes 
  height and width. (Murray Cumming)

Documentation:
* Reference API: Re-extracted C docs, so that the new API
  will be automatically documented. (Murray Cumming)
* examples:
  - input: Use Glib::IOChannel. (Claudio Saavedra)