title: Not Rendering images in react-natives flatlist if using extern uri
body: <p>I just migrated my ListView to the faster FlatList and currently got the issue that images with an external uri aren't rendered. If I'm using require('localUri') everything works fine.</p>
  
  <p>1) The URL is https
  2) I see that the grey rectangles (style of the image) are rendered
  3) Using a local image with require(localImagePath) is working
  4) The imageUrlThumb is valid if I'm requesting on the browser</p>
  
  <pre><code> &lt;FlatList
  data={this.props.items}
  keyExtractor={(item, index) =&gt; index}
  numColumns={3}
  renderItem={rowData =&gt; {
      return (
          &lt;Image
              style={{
                  width: size,
                  height: size,
                  margin: 2,
                  borderWidth: 1,
                  borderColor: "#eee"
              }}
              source={{ uri: rowData.imageUrlThumb, cache: "force-cache" }}
              resizeMode="contain"
          /&gt;
      );
  }}
  /&gt;;
  </code></pre>
  
  <p>Would be nice if anyone could help me with this.</p>
  
  <p>Best regards
  Kay</p>
  
  <p>Environment:
    OS:  macOS High Sierra 10.13
    Node:  6.11.0
    Yarn:  1.2.1
    npm:  5.4.2
    Watchman:  4.9.0</p>
  
  <p>Packages: (wanted => installed)
    react: 16.0.0-beta.5 => 16.0.0-beta.5
    react-native: <a href="https://github.com/expo/react-native/archive/sdk-22.0.1.tar.gz" rel="nofollow noreferrer">https://github.com/expo/react-native/archive/sdk-22.0.1.tar.gz</a> => <a href="https://github.com/expo/react-native/archive/sdk-22.0.1.tar.gz" rel="nofollow noreferrer">https://github.com/expo/react-native/archive/sdk-22.0.1.tar.gz</a></p>