Blender Git Loki

Merge remote-tracking branch 'origin/master' into cycles_camera_nodes

Note: the branch currently crashes in blender_camera_nodes.cpp:
BL::NodeTree b_ntree = b_data.node_groups[nodes_tree_name];

The crash was introduced in:
cb7cf523e5c000609f32a382e2c0fcc57f635a42

Conflicts:
intern/cycles/SConscript
intern/cycles/blender/addon/__init__.py
intern/cycles/blender/addon/properties.py
intern/cycles/blender/blender_camera.cpp
intern/cycles/kernel/kernel_types.h
intern/cycles/kernel/svm/svm.h
intern/cycles/kernel/svm/svm_types.h
intern/cycles/render/camera.cpp
intern/cycles/render/camera.h