title: Add fixed item to select2
body: <p>I am using select2 gem in rails</p>
  
  <p>gem version: 3.5.9.3
  select2 version: 3.5.2</p>
  
  <p>Haml view:</p>
  
  <pre><code>= form_tag('cards/search/', method: :get, remote: true, class: 'navbar-form navbar-right') do
    .form-group
      = hidden_field_tag :q, '', id: 'search', class: 'form-control',
        style: 'width: 250px;',
        data: { 'ajax-url' =&gt; search_path, placeholder: 'placeholder' }
  </code></pre>
  
  <p>In coffescript file</p>
  
  <pre><code>$ -&gt;
    $('#search').select2
      minimumInputLength: 1
      ajax:
        dataType: 'json'
        delay: 250
        data: (params) -&gt;
          q: params
        results: (data) -&gt;
          results: data.q
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/wC2UI.png" alt="Result"></p>
  
  <p>How can I add fixed item to the bottom of options? No matter what I typed in search form.</p>
  
  <p>I tried:</p>
  
  <pre><code>$('#search').append{id: 'test', text: 'test'}
  </code></pre>
  
  <p>But didn't saw that option.</p>