Blender Git Loki

Merged changes in the trunk up to revision 41638.

Conflicts resolved:
doc/python_api/sphinx_doc_gen.py
source/blender/blenkernel/BKE_main.h
source/blender/blenkernel/intern/library.c
source/blender/blenloader/intern/readfile.c
source/blender/blenloader/intern/writefile.c
source/blender/editors/include/UI_resources.h
source/blender/editors/interface/resources.c
source/blender/makesdna/DNA_ID.h
source/blender/makesdna/intern/makesdna.c
source/blender/makesrna/intern/rna_internal.h
source/blender/makesrna/intern/rna_main.c
source/blender/makesrna/intern/rna_main_api.c
source/blender/makesrna/intern/rna_scene.c