Provide an interface for selecting content types that should show the Node To Word links

See @TODO in the code:

/**
 * Function for checking if a content type should have a 
 * "Save as Word" link or not.
 * 
 * @param $type
 *  string: content type to be checked
 * 
 * @return
 *  boolean: TRUE if content type should have a link
 */
function node_to_word_enabled($type) {
  // TODO: This needs to link to an admin interface for picking types
  if ($type == 'story') {
    return TRUE;
  }
}