Support password rotation

[wzrdtales]

This lib is curently missing the support of password rotation. Which can be simply archived by allowing the password param to be an object.

https://github.com/hapijs/hapi-auth-cookie/blob/master/lib/index.js#L24

See for reference

https://github.com/hueniverse/iron/blob/fa4f846bb66e6fceb3d50abf81d79950422f9c0d/lib/index.js#L247-L251

This would be the proper validation alternatives to be added:

    Joi.object({
      id: Joi.alternatives(Joi.number(), Joi.string()).required(),
      secret: Joi.string().required()
    }),
    Joi.object({
      id: Joi.alternatives(Joi.number(), Joi.string()).required(),
      integrity: Joi.string().required(),
      encryption: Joi.string().required()
    })

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