ap stats plugin - code review tweaks

Blake,  

You should see three changed files.  main.js, and your original plugin file renamed to conform to breunigs comments.  No updates were made in dist, so you'll have to build it yourself to see the changes in action.

The changes in plugins/player-tracker.user.js and style.css are riding through I believe because I forked after you.  They should disappear if you rebase.

-Dave