[mutter] (6 commits) Non-fast-forward update to branch gbsneto/effects-paint-nodes

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

The branch 'gbsneto/effects-paint-nodes' 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:

  9d7dbdd... clutter/paint-nodes: Add opacity overriding to ClutterActor
  22aa5ee... clutter/paint-nodes: Don't skip pipeline node constructor
  969988e... clutter/paint-nodes: Add new ClutterLayerNode API
  7370909... clutter/paint-nodes: Push and pop framebuffer even without 
  c0ab924... clutter/paint-nodes: Add serialization to layer node
  fc185d9... Introduce ClutterBlitNode

Commits added to the branch:

  6be6f04... clutter/paint-nodes: Add opacity overriding to ClutterActor
  6f0719b... clutter/paint-nodes: Don't skip pipeline node constructor
  03be5ed... clutter/paint-nodes: Add new ClutterLayerNode API
  c261eb7... clutter/paint-nodes: Push and pop framebuffer even without 
  96e8074... clutter/paint-nodes: Add serialization to layer node
  5d7edde... Introduce ClutterBlitNode