title: react-native-camera freezes app when opened 2 times via navigator
body: <p>I'm using the <a href="https://github.com/lwansbrough/react-native-camera" rel="nofollow">https://github.com/lwansbrough/react-native-camera</a> library in a view that is contained inside a simple <code>&lt;Navigator /&gt;</code> component.</p>
  
  <p>Everything works as expected until you navigate back the Home view and try to reload the View with the <code>&lt;Camera /&gt;</code>. There are no error messages in the console OR in Xcode which makes this extremely hard to pinpoint the problem. </p>
  
  <p>When I delete the entire <code>&lt;Camera /&gt;</code> component, the navigation works as expected and the view reloads fine.</p>
  
  <p>There is currently an open issue on github <a href="https://github.com/lwansbrough/react-native-camera/issues/80" rel="nofollow">https://github.com/lwansbrough/react-native-camera/issues/80</a> but as time is of the essence, I am wondering if anyone else has found a solution to this problem and can share a fix.</p>
  
  <p>standard render method:</p>
  
  <pre><code>render() {
  
      return (
          &lt;View style={styles.outer}&gt;
  
              &lt;Overlay
                  modalVisible={this.state.modalVisible}
                  /&gt;
  
              &lt;Camera
                  ref="cam"
                  style={styles.container}
                  captureTarget={Camera.constants.CaptureTarget.disk}
                  type={this.state.cameraType}&gt;
  
                  &lt;TouchableHighlight style={styles.circlebutton} onPress={this._takePicture}&gt;
                      &lt;Text&gt;Take Picture&lt;/Text&gt;
                  &lt;/TouchableHighlight&gt;
              &lt;/Camera&gt;
  
              &lt;Image
                  source={{uri: this.state.imageURI, isStatic:true}}
                  style={{width: this.state.imageURI ? 100 : 0, height: this.state.imageURI ? 100 : 0, opacity: this.state.imageURI ? 1 : 0}}
                  /&gt;
          &lt;/View&gt;
      );
  }
  </code></pre>