[gnome-music] (12 commits) Non-fast-forward update to branch wip/gtkmaster

[Vadim Rutkovsky <vrutkovsky src gnome org>]

The branch 'wip/gtkmaster' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 http://live.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  5a310c9... Use headerbar
  8784ed4... Set headerbar as titlebar
  eb293e5... Add close button
  438774c... Do not show close button on selection mode
  0555794... Fix for latest update on libgd
  f873489... Do not get the spinner rendered

Commits added to the branch:

  2c93196... AlbumArtCache: cleanup the public interface and correct the (*)
  de7293a... Player: make it observable from the outside (*)
  c25b9c0... player: don't connect to GstPlaybin::about-to-finish (*)
  b3db9c7... player: clean up and restructure playlist handling (*)
  6236baf... player: consolidate and cleanup the code handling the repea (*)
  a1891b7... tests: don't check for button status, this depends on setti (*)
  7d48fa9... Use headerbar
  89e59f6... Set headerbar as titlebar
  983f89c... Add close button
  560362c... Do not show close button on selection mode
  d2f8fd1... Fix for latest update on libgd
  6f64d40... Do not get the spinner rendered

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