IECoreMaya: Added defaultShapeName to FnDagNode to generate the shape name for a transform with Maya naming convention.
IECoreMaya: Added defaultShapeName to FnDagNode to generate the shape name for a transform with Maya naming convention.

lento/cortex,appleseedhq/cortex,davidsminor/cortex,appleseedhq/cortex,lento/cortex,goddardl/cortex,davidsminor/cortex,danieldresser/cortex,lento/cortex,danieldresser/cortex,danieldresser/cortex,appleseedhq/cortex,davidsminor/cortex,hradec/cortex,davidsminor/cortex,goddardl/cortex,danieldresser/cortex,goddardl/cortex,hradec/cortex,hradec/cortex