Eli White ee26d9bcb0 Make StyleSheet.create type private
Summary:
This type is being used in many places where a much simpler type is often better. In a real pinch this type can still be accessed as so:

```
function returnsStyleSheet(
): $Call<typeof StyleSheet.create, *> {
  return StyleSheet.create({
    root: {
      background: 'white',
    }
  })
}

returnsStyleSheet().foo // foo doesn't exist
returnsStyleSheet().root // okay
```

Reviewed By: yungsters

Differential Revision: D7178524

fbshipit-source-id: 3c0ed03486ca00f1e287261e402fd47807f1fc3d
2018-03-07 12:16:53 -08:00
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