Updating a layer’s property doesn’t also update the inspector panel
For example, if you set a fill color for a layer like this:
```
layer.style.fills = [{
   color: #1ca9c4,
   fill: Style.FillType.Color
})
```
The layer will update properly but the inspector panel doesn’t update. Currently I have to manually reload the inspector panel each time with `document.sketchObject.inspectorController().reload()`

Ideally this is already handled for me when setting a layer property.

Here is an example of this issue:
![jun-09-2018 00-59-45](https://user-images.githubusercontent.com/4199296/41196880-3387e590-6c00-11e8-8fd9-1a853e2fc21a.gif)
