title: force select2-plugin to show all items
body: <p>I am using <a href="http://ivaynberg.github.io/select2/" rel="nofollow">select2</a> and would like to force it show all available options when expanded instead of adding a scrollbar. </p>
  
  <p>Right now it has a scrollbar inside the option area: <a href="http://screencast.com/t/fYKPArqz5f" rel="nofollow">http://screencast.com/t/fYKPArqz5f</a></p>
  
  <p>Is that possible?</p>