Add support for Turf transformScale

还没有人认领这个 Issue。

Have seen some maps examples in the wild that do some interesting data visualization with "radiating" Polygon `FillLayer`s. This is possible with Mapbox but it'd be a lot easier to do this with [the Turf transformScale method ](http://turfjs.org/docs/#transformScale)

Ancestry.com (Mapbox):

Caviar food delivery (GMaps):

Port https://github.com/Turfjs/turf/blob/master/packages/turf-transform-scale/index.js to this repo's Turf package. Looks like [this method uses a lot of other ones](https://github.com/Turfjs/turf/blob/master/packages/turf-transform-scale/index.js#L1-L10)

阅读 Turf 的 packages/turf-transform-scale/index.js，尤其是其中列出的依赖项，然后在此存储库中找到对应的 Turf 包。移植 transformScale 方法，并验证 Java 包提供的缩放行为与所引用的 Turf 实现等效。

由索引模型根据 Issue 内容生成。