Added auth_token to ajax urls for deleting and updating RUs.

To test, try updating any/all of the following: the tag, the title, the date, or the content. Also try deleting. In each case, you will get logged out, since there is no auth token with each of the above requests.

Trello Card URL: https://trello.com/c/6bagKfg2/851-ru-issues-w-auth-token