title: ion-select does not display correctly
body: <p>I'm trying to implement select options provided by ionic framework
  as mentioned here
  <a href="http://ionicframework.com/docs/v2/api/components/select/Select/" rel="nofollow noreferrer">http://ionicframework.com/docs/v2/api/components/select/Select/</a></p>
  
  <pre><code>&lt;ion-item&gt;
    &lt;ion-label&gt;Toppings&lt;/ion-label&gt;
    &lt;ion-select multiple="true"  okText="Okay" cancelText="Dismiss"&gt;
      &lt;ion-option ng-selected="selected"&gt;Bacon&lt;/ion-option&gt;
      &lt;ion-option&gt;Black Olives&lt;/ion-option&gt;
      &lt;ion-option&gt;Extra Cheese&lt;/ion-option&gt;
      &lt;ion-option&gt;Mushrooms&lt;/ion-option&gt;
      &lt;ion-option&gt;Pepperoni&lt;/ion-option&gt;
      &lt;ion-option&gt;Sausage&lt;/ion-option&gt;
    &lt;/ion-select&gt;
  &lt;/ion-item&gt;
  </code></pre>
  
  <p>On rendering the page, the select options they don't show up correctly and appears like a single list item. 
  I looked for examples everywhere but most of them uses the standard html select tag instead of ion-select. Is this because ion-select requires additional css or do I need add some more code to make it work ? I'm really not sure what am I missing here.</p>
  
  <p><a href="https://i.stack.imgur.com/SBEF9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SBEF9.png" alt="enter image description here"></a></p>