2.13.8:

* Context: Added set_font_map() because the C function is now 
  public (non backend-only) API.
* LayoutRun/GlyphItem: Added split() and letter().
* Renderer: Added draw_glyph_item().
* CairoFontMap:: Added set_default().
  (Murray Cumming)
* Build: Updated the MS Visual Studio 2005 build.
  (Armin Burgmeier)