title: Bootstrap multiselect with fixed search input
body: <p>Is it possible to set the search input to be fixed in the Bootstrap Multiselect? I don't want to scroll also the search input with the selectable elements. I saw it is rendered as a list item (<code>&lt;li&gt;</code>), that's why is scrollable. I didn't found a configuration option which changes that behavior. </p>
  
  <p><a href="http://jsfiddle.net/myrluk3/a6hv0zvj/3/" rel="nofollow">JsFiddle</a></p>