Summary:
We still need to wait for the `YGUnitPoint` PR to be merged :) But please let me know what you think. One caveat: because of a limitation of Swift, a literal value can be automatically understood as a point-based `YGValue`, but variables have to be explicitly cast. I haven't found a way around it yet:
```
view.yoga.width = 10 // value == 10, unit == YGUnitPixel
let a: CGFloat = 100
view.yoga.height = a // Compiler error
view.yoga.height = YGValue(a) // works, not great
```
Closes https://github.com/facebook/yoga/pull/390
Reviewed By: emilsjolander
Differential Revision: D4954021
Pulled By: maxoll
fbshipit-source-id: 5eff6aeb6dd969d0d5dc557b149bb5819b0e31de
Summary: Using the newer/recommended API in the sample project. #accept2ship
Reviewed By: emilsjolander
Differential Revision: D4698936
fbshipit-source-id: 07b61df897524cd38390ba48dfa2a2e10942329b
Summary:
To date, our sample project was lacking. There is still a lot of work that can be done to improve, but, this is a step in the right direction.
Here are the changes in this commit:
1. The project is written in Swift.
2. Created new CollectionView (via [IGListKit](https://github.com/instagram/iglistkit)), making it very easy to add new examples.
3. New examples for basic layouts, and including/excluding layouts on the fly.
Here's a video!

Closes https://github.com/facebook/yoga/pull/392
Reviewed By: emilsjolander
Differential Revision: D4550379
Pulled By: dshahidehpour
fbshipit-source-id: 64a07acf96c1887f1d2ad0c54971fcedb64334a0
Summary: The Sample app needed some love. It wouldn't build because of some import errors, adding files is very manual, and it looked bad. I have fixed all of these things.
Reviewed By: amonshiz
Differential Revision: D4508624
fbshipit-source-id: bda40defb167ef871d8d0d5bb853d8905b9682d8