counter: 1.1.7 - Fixed a bug in the assertion-logic for the expected state

- Each combination of a user and a word is a uniq key.
- Since the ordering is only guaranteed for messages, with the same key,
  no expectations can be made according the ordering of messages with
  different keys!
- This also simplifies the test-logic, because no deserialization is needed
  any more to pick the username out of the JSON-data.