[gtk] (15 commits) ...Merge branch 'wip/otte/for-master' into 'master'

[Benjamin Otte <otte src gnome org>]

Summary of changes:

  6c473d5... glrenderer: Handle NULL debug messages (*)
  c8fc40e... rendernodeparser: Print properties alphabetically (*)
  ed0ecf0... rendernodeparser: Allow single values instead of 4 (*)
  20d1bc2... rendernodeparser: Skip root node when it's a container (*)
  0fd0be4... testsuite: Redo node-parser (*)
  a1d08b4... rendernode: Take a graphene_point_t for the offset (*)
  678aa80... rgba: Add GDK_RGBA() macro (*)
  1a65a6c... rendernodeparser: Update to new rules (*)
  b90a66c... rendernodeparser: Allow parsing strings (*)
  b37c221... testsuite: Add empty node tests (*)
  29cb923... rendernode: Blur alpha channel for cairo blur node (*)
  eb38613... testuite: Improve compare-render binary (*)
  0a32305... testsuite: Add render tests for all the empty nodes (*)
  63a8144... testsuite: Remove serialize-deserialize test (*)
  321a210... Merge branch 'wip/otte/for-master' into 'master'

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