title: AngularJS ui-select minimum-input-length not telling user to type in more characters
body: <p>Is there any already made extension or even built-in option for angularJS's ui-select (select2 theme) to display information for user to input more characters to display results when using   </p>
  
  <pre><code> minimum-input-length=3
  </code></pre>
  
  <p>option? I am talking about feature like </p>
  
  <pre><code>formatInputTooShort(function() {return "Input more characters!;});
  </code></pre>
  
  <p>in jQuery select2 (<a href="https://select2.github.io/select2/" rel="nofollow">https://select2.github.io/select2/</a>).</p>
  
  <p>Here's plunker set up with basic select using library versions I use: <a href="http://plnkr.co/edit/K9alAMAzvUqCY7Or8RwY?p=preview" rel="nofollow">http://plnkr.co/edit/K9alAMAzvUqCY7Or8RwY?p=preview</a></p>
  
  <p>I've been googling this for ages and haven't been able to find any existing solution.</p>
  
  <p>Sorry for that not very valid code snippets, I had to use them to be able to include plunker snippet. Any help or hint appreciated.</p>