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Update Getting Started instructions
Remove call to MTLModel method that no longer exists
Update README to reflect new APIs
Better phrasing for final paragraph
Remove talk of Core Data concurrency
It's too contentious, and not really relevant to the larger point being made.
First pass at a CONTRIBUTING file
The parameter needs to be an object too, obvs.
Fix incorrect transformer code in README
MTLValueTransformer can't return primitives, and doesn't need to.
Move Getting Started section to the top
Remove note about geometry additions
Add a section about persistence
Replace most of the README with the Mantle blog post
fix link to MTLModel.h
Added a Contributing section to the README
Better, more informational README
Hopefully suitable for public release.