Pull request to master

`scoreRefreshWithNewHighScore:` method name is a bit misleading as it says `... WithNewHighScore:` but it accepts a boolean as a parameter. 

Minor improvements for this `if` statement could either be:
* Making a temp variable that stores the result of `(_scoreCurrent > _highScore)` and then passing it to the refresh high score method.
* Making a method that returns the result of the expression and then passing it to the refresh high score method.
* `[self scoreRefreshWithNewHighScore:(_scoreCurrent > _highScore)];` (this isn't very readable though)