[gtk] (18 commits) Non-fast-forward update to branch image-loading

[Matthias Clasen <matthiasc 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:

  b199607... Add code to load and save pngs
  be7e9a7... Load pngs without gdk-pixbuf
  a5e9751... Add code to load and save tiff files
  0e0e1c1... Load tiffs without gdk-pixbuf
  2bcb032... Add gdk_texture_save_to_file
  8ec4cb0... Use our png loader for content (de)serialization
  47e763a... Use our tiff loader for content (de)serialization
  3f7a5aa... Add code to load jpegs
  6b341f8... Load jpegs without gdk-pixbuf

Commits added to the branch:

  0782c8a... gdk_rgba_parse: Support HSL colors (*)
  9e11ea6... Merge branch 'hsl' into 'master' (*)
  9f2b847... rendernode: Write the whole node (*)
  140976a... Merge branch 'wip/otte/for-master' into 'master' (*)
  46f88c6... Update Hungarian translation (*)
  e132b8a... Add code to load and save pngs
  11ae8b7... Load pngs without gdk-pixbuf
  46cd5ad... Add tests for the png loader
  a09ca9e... Add code to load and save tiff files
  5d41546... Load tiffs without gdk-pixbuf
  d6150d2... Add tests for the tiff loader
  465db72... Add gdk_texture_save_to_file
  13eb8e0... Use our png loader for content (de)serialization
  8729246... Use our tiff loader for content (de)serialization
  a6b7530... Add contentserializer tests for textures
  f08e629... Add code to load jpegs
  7dd1016... Load jpegs without gdk-pixbuf
  b7a5925... Add tests for the jpeg loader

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