[pango] (11 commits) ...Merge branch 'font-variations'

[Behdad Esfahbod <behdad src gnome org>]

Summary of changes:

  53c483c... Add some font description tests (*)
  95c2aaa... Test attribute iterators (*)
  efa66e7... Add initial support for OpenType font variations (*)
  3ccb608... Add some tests with variations (*)
  a78ce2a... pango-view: Add a font-variations example (*)
  4713461... Add an out-of-range value (*)
  6a9c066... [fc] Request variable fonts from fontconfig (*)
  905ccc5... [fc] Only set variations if non-empty (*)
  e4e3053... [cairo] Don't set font variations on cairo_font_options_t (*)
  cb84dd0... Make variations test more generic (*)
  b970898... Merge branch 'font-variations'

(*) This commit already existed in another branch; no separate mail sent