title: Crop image with react-native
body: <p>Hello World,</p>
  
  <p>I trying to crop an image like explain on the <a href="https://facebook.github.io/react-native/docs/images.html#source-as-an-object" rel="noreferrer">React-native Doc</a></p>
  
  <pre><code>&lt;Image source={{uri: this.props.image, crop: {left: 50, top: 50, width: 100, height: 100}}} style={{height: 100, width: 100}}/&gt;
  </code></pre>
  
  <p>But it's doesn't work the image is not cropped.</p>
  
  <p>Any idea?</p>