Overview of changes between 1.5.0 and 1.5.1
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* Add ellipsization support to PangoLayout
* Add pango_context_get_font_map().
* Fix metrics for the Xft backend when a transform is in effect
* Separate out backend-independent parts of pangoft2topgm for
  future rendering testbeds.
* Code cleanups (use G_DEFINE_TYPE, make PangoMatrix parameters const)
* Add a GType for PangoMatrix [Torsten Schoenfeld]
* Misc bug fixes [Morten Welinder]