title: React-native-image-progress doesn't show progress
body: <p>I'm using <a href="https://github.com/oblador/react-native-image-progress" rel="nofollow noreferrer">react-native-image-progress</a> to render network images. Following the instructions, I also installed <a href="https://github.com/oblador/react-native-progress" rel="nofollow noreferrer">react-native-progress</a>.</p>
  
  <p>Here's my component(very similar to the example):</p>
  
  <pre><code>&lt;Image
          source={{ uri: 'http://loremflickr.com/640/480/dog' }}
          indicator={ProgressCircle}
          indicatorProps={{
            showsText: true,
          }}
          style={{
            width: 320,
            height: 240,
          }}
   /&gt;
  </code></pre>
  
  <p>The indicator - circle appears normally, but circle just spins randomly, no signal of any progress and no text showed as well. After a while, the picture is rendered.</p>
  
  <p>I also tried adding <code>indeterminate: false</code> into <code>indicatorProps</code>. This time it shows text but is locked at 0%; then after a while picture is rendered.</p>
  
  <p>What possibly have I done wrong?</p>