adapt to refactoring in core USD of registry handling of prim specs versus prim definitions#738

Merged

kxl-adsk merged 3 commits intoAutodesk:devfrom mattyjams:pr/prim_spec_vs_prim_definition_refactoring

Aug 27, 2020

+110-29

Commits on Aug 25, 2020

Refactoring some code in UsdMayaAdaptor in preparation for another change where we will replace the prim spec in SchemaAdaptor with a pointer to a UsdPrimDefinition.
mattyjams
committed
Replacing UsdSchemaRegistry::GetSchemaPrimSpec() in Maya's schema adaptor
mattyjams
committed
update most recent supported core USD commit in build.md
mattyjams
committed