* [spritekit] Update for iOS 10 beta 1
* [spritekit] Add missing MarshalDirective
* [runtime] Add missing simd function signatures
- Add matrix_float2x2 and matrix_float3x3 natives types.
* [introspection] Fix ApiSignatureTest
- We now avoid checking {?=[X]} encoded signatures.
- We now calculate the right size for matrix_float2x2, matrix_float3x3 and matrix_float4x4.
- Fix SKWarpGeometryGrid wrong bindings revealed by tests (IntPtr instead of Vector2).
* [monotouch-test] Add SKUniform and SKWarpGeometryGrid tests
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