Added support for global N in OSLRenderer.
Added support for global N in OSLRenderer.

cedriclaunay/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,johnhaddon/gaffer,chippey/gaffer,hradec/gaffer,boberfly/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,hradec/gaffer,appleseedhq/gaffer,goddardl/gaffer,chippey/gaffer,appleseedhq/gaffer,johnhaddon/gaffer,hradec/gaffer,andrewkaufman/gaffer,goddardl/gaffer,andrewkaufman/gaffer,cedriclaunay/gaffer,chippey/gaffer,GafferHQ/gaffer,ivanimanishi/gaffer,boberfly/gaffer,appleseedhq/gaffer,cedriclaunay/gaffer,davidsminor/gaffer,lucienfostier/gaffer,davidsminor/gaffer,ImageEngine/gaffer,cedriclaunay/gaffer,GafferHQ/gaffer,boberfly/gaffer,boberfly/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,davidsminor/gaffer,lucienfostier/gaffer,hradec/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,goddardl/gaffer,hradec/gaffer,chippey/gaffer,davidsminor/gaffer,goddardl/gaffer,ivanimanishi/gaffer