title: ng-disabled option in angular ui-select shrinks the text box
body: <p>I am using angular ui-select directive and trying to disable it with ng-disabled option.</p>
  
  <pre><code>&lt;ui-select multiple ng-model="address.selected"
               theme="bootstrap"
               ng-disabled="true"
               reset-search-input="true"
               style="width: 300px;"&gt;
  </code></pre>
  
  <p>Here is the plunker <a href="http://plnkr.co/edit/julETCG4zCGAxFJ0PSBF?p=preview" rel="nofollow">http://plnkr.co/edit/julETCG4zCGAxFJ0PSBF?p=preview</a></p>
  
  <p>Size of the text box shrinks with ng-disabled="true". </p>