2.5.2:

Gtk:
* Button: Added set/get_image().
* CellView: Removed set_cell_data().
* Dialog: Added set_alternative_button_order().
* FileChooserButton:
  - Now inherits from HBox, not Button.
  - Removed get/set_active().
* IconInfo: Added operator bool(), needed to check 
  the result of IconTheme::lookup_icon().
* Label: Added get/set_angle().
* TreeView: Added append_column_numeric(), and append_column_numeric_editable(),
  which allow more control over the formatting of numeric data than 
  append_column() and append_column_editable().
  (Murray Cumming)

Pango:
* Added Renderer.
* Context: Added get/set_matrix().
* FontMetrics.hg: Added get_underline_position(), 
  get_underline_thickness(), get_strikethrough_position(), 
  get_strikethrough_thickness().
  (Murray Cumming)

Documentation:
* example/book/input/: This now works. (Chris Vine)
* Book:
  - TreeView selection: Use selected_foreach_iter() 
  instead of selected_foreach(). (Teus Benschop)
  - Fixed some typos. (Claudio Saavedra)