Some Additions for consideration.

Added: 
- VanillaJS version for implementing transferring props with ES6 and helper functions (not waiting for rest operator to be supported on object properties)
- An edit on Primitives, so the render method takes the `props` as an argument and is consistent with Core
- Added a point on Layout Components to mention a feature to be added to Chrome soon, that should considered
- Wrote a section explaining some of the downsides with Inline Styles