Implement a score
Fix typos in comment
Changed setup code to use WagersFactory
Changed test result to match the new setup code; this is the only change in the tests the new setup code causes. This change comes from the fact that the old setup code set correct? whithout taking into consideration whether or not the confidence was over 50%, while the new code does. The wagers in @i100 are a 0% wager that is marked as right, and a 100% wager that is still unknown. The old code would see that the first wager was marked right, and wrongly think that this means that the predictor got a prediction correct. However, the predictor said that the prediction *wouldn't happen*, and so really they got it wrong. The new setup code takes this into account when setting the correct? method, and so now it rightly says that @i100.accuracy should be 0, not 100 as the old code wrongly set it up to be.
Fix for minor typo in comment
Clean up code.

- Remove trailing whitespaces.

- Use more parenthesis. It's not a personal preference, just make the
  coding style more consistent.
Merge branch 'foxbenjaminfox-scoring'