Allow `on_rotation` in MessageEncryptor to be passed in constructor:

- Use case:

  I'm writing a wrapper around MessageEncryptor to make things easier
  to rotate a secret in our app.

  It works something like
  ```ruby
  crypt = RotatableSecret.new(['old_secret', 'new_secret'])
  crypt.decrypt_and_verify(message)
  ```

  I'd like the caller to not have to care about passing the
  `on_rotation` option and have the wrapper deal with it when
  instantiating the MessageEncryptor object.

  Also, almost all of the time the on_rotation should be the same when
  rotating a secret (logging something or StatsD event) so I think
  it's not worth having to repeat ourselves each time we decrypt a message.

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