[gtk] (11 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:

  e45f359... Add tests for the png loader
  e9c99d3... Add code to load and save tiff files
  9ed4ee5... Load tiffs without gdk-pixbuf
  c358c0e... Add tests for the tiff loader
  345bd19... Add gdk_texture_save_to_tiff
  f1c0631... Use our png loader for content (de)serialization
  94e55c8... Use our tiff loader for content (de)serialization
  2c1e124... Add contentserializer tests for textures
  ea5fdfb... Add code to load jpegs
  6d36fea... Load jpegs without gdk-pixbuf
  76ae4ab... Add tests for the jpeg loader

Commits added to the branch:

  f882e0a... Add tests for the png loader
  24b42ff... Add code to load and save tiff files
  fd01ce6... Load tiffs without gdk-pixbuf
  5836309... Add tests for the tiff loader
  4a982d0... Add gdk_texture_save_to_tiff
  c200227... Use our png loader for content (de)serialization
  df376ca... Use our tiff loader for content (de)serialization
  811872e... Add contentserializer tests for textures
  be48cbd... Add code to load jpegs
  4a2f668... Load jpegs without gdk-pixbuf
  ed2b3d7... Add tests for the jpeg loader