title: Bootstrap tagsinput Can't add objects when itemValue option is not set
body: <p>I've seen this question <a href="https://stackoverflow.com/questions/29703773/bootstrap-tagsinput-add-tag-with-id-and-value">Bootstrap tagsinput add tag with id and value</a>, but the solution is not working for me:</p>
  
  <p>What I'm finding is that in order to get the input box recognising tags that I type in, I either have to have data-role = tagsinput OR call $("input").tagsinput().</p>
  
  <p>eg. This works for recognising tags with no data-role:
       </p>
  
  <pre><code>$('#meeting-tags').tagsinput();
  $('#meeting-tags').tagsinput({
    allowDuplicates: false,
      itemValue: 'id',  // this will be used to set id of tag
      itemText: 'label' // this will be used to set text of tag
  });
  </code></pre>
  
  <p>But this does not:</p>
  
  <pre><code>$('#meeting-tags').tagsinput({
    allowDuplicates: false,
      itemValue: 'id',  // this will be used to set id of tag
      itemText: 'label' // this will be used to set text of tag
  });
  </code></pre>
  
  <p>However, if I want to add items via javascript then it will only work if I neither have data-role nor have an initial call.  The error is Can't add objects when itemValue option is not set</p>
  
  <p>eg. this works but now it doesn't recognise tags:</p>
  
  <pre><code>$('#meeting-tags').tagsinput({
        allowDuplicates: false,
          itemValue: 'id',  // this will be used to set id of tag
          itemText: 'label' // this will be used to set text of tag
      });
  $('#meeting-tags').tagsinput('add', { id: 'tag id', label: 'tag lable' });
  </code></pre>
  
  <p>but this does not but now it recognises tags again:</p>
  
  <pre><code>$('#meeting-tags').tagsinput();
  $('#meeting-tags').tagsinput({
        allowDuplicates: false,
          itemValue: 'id',  // this will be used to set id of tag
          itemText: 'label' // this will be used to set text of tag
      });
  $('#meeting-tags').tagsinput('add', { id: 'tag id', label: 'tag lable' });
  </code></pre>
  
  <p>There must surely be a way of BOTH being able to recognise tags and add items?</p>