Image primitive is broken within Sketch Beta v47 (45292)
**Expected behavior:** 
The `Image` primitive should render an image.

**Observed behavior:**
Instead a red box appears with the following message.

<img width="500" alt="screen shot 2017-09-08 at 10 29 07" src="https://user-images.githubusercontent.com/350388/30202971-9ec96444-9480-11e7-81db-e61d71e31880.png">

**How to reproduce:**
* Install Sketch Beta v47
* Create a .skpmrc file in your home directory
* Add the following contents, to make sure react-sketchapp uses the beta release `{ sketchPath: '/Applications/Sketch Beta.app' }`
* Try to run the profile-cards example contained within the examples folder.

**Sketch version:**
Sketch Beta v47
