Better reading of Blender color spaces (#255)
Better reading of Blender color spaces (#255)

* Better reading of Blender color spaces

Blender->USD appears to write the "Filmic sRGB" space as "Filmic_sRGB".
Added special cases to change those color spaces back to our names.

tangent-opensource/hdBlackbird,tangent-opensource/hdBlackbird,tangent-opensource/hdBlackbird