title: Align Button to Bottom in ScrollView
body: <p>I'm trying to align a button to bottom of the ScrollView and make the ScrollView fill the page. First screenshot is how it looks like and the second one is what I want.</p>
  
  <p><a href="https://i.stack.imgur.com/2964k.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2964k.png" alt="Current Status"></a></p>
  
  <p><a href="https://i.stack.imgur.com/2FSD4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2FSD4.png" alt="What I want"></a></p>
  
  <p>In the screenshots, ScrollView is not used since there aren't enough items but number of items inside of the ScrollView is not fixed.</p>
  
  <p>Render():</p>
  
  <pre><code>&lt;ScrollView style={styles.scrollViewContainer}&gt;
        &lt;View style={{flex: 1, justifyContent: 'space-between', flexDirection: 'column'}}&gt;
          &lt;View style={{flex: 1}}&gt;
            &lt;Text style={styles.bigTitle}&gt;Title&lt;/Text&gt;
            &lt;View style={styles.formContainer}&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
              &lt;Text&gt;Hello&lt;/Text&gt;
            &lt;/View&gt;
          &lt;/View&gt;
          &lt;SignupButton onPress={this.submit} title="Next Step" image={require("../Images/right_btn.png")} boldText={true} /&gt;
        &lt;/View&gt;
      &lt;/ScrollView&gt;
  </code></pre>
  
  <p>Style:</p>
  
  <pre><code>  scrollViewContainer: {
      backgroundColor: '#fff',
    },
    formContainer: {
      paddingTop: 10,
      paddingLeft: 50,
      paddingRight: 50,
      paddingBottom: 30,
    },
    bigTitle: {
      fontSize: 24,
      textAlign: 'center',
      marginTop: 20,
      marginBottom: 20,
    },
  </code></pre>