merge user interface

[JaimieMurdock]

For the merge user interface, add tabs to the top of the page that indicate each of the similar citations. The first tab should be the tab that all entries will be merged into and should be set apart by background color and an icon from Bootstrap.

Each field should have a input-btn-group added to it with a caret inside:

<div class="input-group">
  <input type="hidden" name="doc" id="hidden_id">
  <input type="text" id="doc" class="form-control" placeholder="Document" autocomplete="off">
  <div class="input-group-btn">
    <button class="btn btn-default" type="button" id="randomDoc">
      <span class="caret"></span>
    </button>
  </div>
</div>

The Bootstrap dropdown for the button should pull up the values for that field in all of the tabs. Selecting an option should populate the field on the merged tab with that value.

Finally, there should be a way to mark similar entries as not similar, so an x or a trashcan icon should be added to the tab to remove it or flag it with a red background to remove.