Michael Schneider 12e4e5b048 [Layout] Improve Layout System Abstraction (#2941) ...

* Improve Layout Abstraction

* Address naming comments

- Rename ASPrimitiveTraitEnvironment to ASTraitEnvironment
- Rename ASPrimitiveTraitCollectionPropagateDown to ASTraitCollectionPropagateDown
- Rename progagateNewPrimitiveTraitCollection: to propagateNewTraitCollection:

2017-02-03 13:04:20 -08:00

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