Merge pull request #51 from roverdotcom/DEV-2153

[DEV-2153] Refashion "People" page into a leaderboard.
[DEV-2154] Add leaderboard position link to user card.
[DEV-2154] Remove leaderboard position link for non-leaderboard-eligible users.
[DEV-2154] Add user location to "Book a Stay With Me" message.
[DEV-2154] Adjust styles and markup to fit location link.
[DEV-2154] Add "Treat(s)" and proper pluralization to rep on user card.
[DEV-2154] Style user card to fit on network page.