code: function deleteAssociationPosition(req, res) {
    if(redirect(req.params.id, '../', '/tags', res)) {
      return;
    }
  
    var id = req.params.id;
    var rootUrl = req.protocol + '://' + req.get('host');
    var queryPath = req.originalUrl;
    req.chickadee.removeAssociation(req, id, 'position', rootUrl, queryPath,
                                    function(response, status) {
      res.status(status).json(response);
    });
  }
docs: Delete the specified association position.
  @param {Object} req The HTTP request.
  @param {Object} res The HTTP result.