Sort by Open Reviews, make Completed Reviews secondary

Use Open Reviews as the primary stat, and don't limit them to the past 30 days.

Also display Completed Reviews a la the current Hall of Fame, but as a secondary stat.

For example, Bob has 3 reviews waiting on him, and has completed 21 in the past 30 days.
Bob.... 3/21

Sorry about the weird diff, it's because xapps uses the code formatter.

We might have some space issues with cwinzenburg. My best crack at that so far was this css change, but I left it out because it might not be an issue and nobody would tell me the screen resolution of the monitor in SF. :) Try it and let me know what you think:

.leaderboard .name {
  display: inline-block;
  padding-right: 0.5em;
  max-width: 8em;
  overflow: hidden;
  white-space: nowrap;
}

![screen shot 2014-04-24 at 5 54 01 pm](https://cloud.githubusercontent.com/assets/32307/2795983/6ba67726-cc03-11e3-8716-77adf3724823.png)