Vala 0.15.1
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 * Support arrays with nullable elements.
 * Add <doc> support to .gir reader and writer.
 * Switch clutter-gtk-1.0 bindings to .gir.
 * Switch gio-2.0 bindings to .gir.
 * Add cogl-pango-1.0 bindings.
 * Add gdl-3.0 bindings.
 * Add libnl-3.0 bindings.
 * Add packagekit-glib2 bindings.
 * Add xtst bindings.
 * Many bug fixes and binding updates.