Hh refactor

Hi David,

So you were pretty close for most of this.  We'll review in person, but for now I just made some fixes to the indentation & whitespace and changed your instance variables & view so that the wins & losses are actually displayed on the leaderboard page.  Currently the `opponents` method is broken so it isn't tracking wins and losses properly, but it's almost there.

Take a look at the edits I made by clicking the "Files changed" tab and then we can take a look later today together.

Thanks!

Helen