[gnome-control-center] (7 commits) Non-fast-forward update to branch gbsneto/background

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

The branch 'gbsneto/background' 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:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  819ec56... background: Switch to GtkFlowBox
  7a6ba04... background: Remove CcBackgroundChooserDialog
  2462c5d... background: Use the cairo_t provided by GTK
  aff1bcd... background: Move preview to CcBackgroundPreview
  457aa91... background: Use widgets to render slideshow emblem
  f0365bf... background: Render thumbnails at 16:9

Commits added to the branch:

  521ce1f... background: Switch to GtkFlowBox
  01868ed... background: Remove CcBackgroundChooserDialog
  f1bb3ce... background: Use the cairo_t provided by GTK
  0137bd5... background: Move preview to CcBackgroundPreview
  8325711... background: Use widgets to render slideshow emblem
  fcad5f7... background: Introduce BgRecentSource
  45c6907... background: Manage recent backgrounds