title: How can I search from two fields in a select2 dropdown
body: <p>I have just started using select2 and it is working fine when I fill the selections up with two fields using:</p>
  
  <pre><code>    function formatemp(item) { return  item.empnum + " : " + item.empname; }
  
  $("#empsDropDown").select2({
       data:{ results: &lt;?PHP echo json_encode($employees);?&gt;, text: 'empname'},
       placeholder: " &lt;?PHP echo lang("All");?&gt; ",
       minimumInputLength: 2,
       allowClear: true,
       id: function(obj) {return obj.empnum;  },
       formatResult: formatemp,
       formatSelection: formatemp
   });
  </code></pre>
  
  <p>It displays in the format </p>
  
  <p>001 : Bloggs</p>
  
  <p>The search works using the </p>
  
  <pre><code>text: 'empname'
  </code></pre>
  
  <p>bit. so it only searches on the name. If you type 'B' in the search box, it will filter and find Bloggs etc. However if you type '0' in the search box it will return no results.</p>
  
  <p>Is there anyway to get it to search both fields (empname and empnum)?</p>
  
  <p>I am new to select2 so I'm hoping this is something obvious that I havent tried yet.</p>
  
  <p>I have tried 
      <code>text: 'empname' + 'empnum'</code> and <code>text: 'empname', text: 'empnum'</code> </p>
  
  <p>amongst other things and I have searched the docs and on this site but I can only seem to get it  to search on either one or the other, not both. I have also tried a custom matcher but that didn't seem to fit the purpose either.</p>