title: Add new values to a tag field by pressing enter instead of comma
body: <p>I have a tag field and I want my users to be able to add new values to it.  I can achieve this by setting <code>forceSelection: false</code>.  The user can type their new entry into the tag field.  When they are done typing the current entry, they can press comma and it will be added.</p>
  
  <p>The problem is that the comma key is not terribly intuitive and more importantly the user cannot add an entry that itself contains a comma.  Is there anyway I can reassign this functionality to the enter key instead?</p>
  
  <p>jsFiddle here: <a href="http://jsfiddle.net/q0psjsx9/" rel="nofollow">link</a></p>