Added a nonce to AuthToken; this is needed as when creating a new instance, the token must never be the same even when the "content" of the token is identical.

git-svn-id: https://svn.apache.org/repos/asf/wookie/trunk@1574082 13f79535-47bb-0310-9956-ffa450edef68
Use nonce and single use flag when encrypting and decrypting tokens

git-svn-id: https://svn.apache.org/repos/asf/wookie/trunk@1574084 13f79535-47bb-0310-9956-ffa450edef68