[gtk] (12 commits) Non-fast-forward update to branch image-loading

[Benjamin Otte <otte src gnome org>]

The branch 'image-loading' 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:

  d102009... icontheme: Load textures directly when possible
  da1e5bf... icontheme: Use textures more
  86faf0f... builder: create textures without pixbufs
  d398ed7... cssimageurl: Just create a texture directly
  4a2f694... builder: Stop using pixbufutils
  7f8e723... Add code to save jpegs
  18f0c93... contentdeserializer: Use our on jpeg loader
  415b2e6... Support 16bit formats in the png loader

Commits added to the branch:

  dcd873a... builder: create textures without pixbufs
  729ad8e... cssimageurl: Just create a texture directly
  fecb31b... builder: Stop using pixbufutils
  e720f9d... Add code to save jpegs
  14280b5... contentdeserializer: Use our on jpeg loader
  b226478... Support 16bit formats in the png loader
  a85f4ec... icontheme: Load textures directly when possible
  b5da07f... icontheme: Use textures more
  4fcf547... icontheme: Insist that people provide proper values
  e58f70d... pixbufutils: Don't hardcode formats
  b271a94... texture: Rework error enum
  f340bbd... texture: Refactor gdk_texture_new_from_bytes()