Checking if we need to convert st and extraST before doing it.
PointSmoothSkinningOp handles faceVarying normals and added refIndices parameter.
Addressed note on test
Merge branch '8_maintenance' of https://github.com/valeriebernard/cortex into valeriebernard-8_maintenance
Merge branch 'valeriebernard-8_maintenance'
Merge branch 'master' of https://github.com/ImageEngine/cortex

Conflicts:
	src/IECore/PointSmoothSkinningOp.cpp
Merge pull request #315 from valeriebernard/master

merge maintenance 8 changes into master