c13-1: add basic upvoting algorithm
c13-2: gray out upvote link when not login or already voted.
c13-3: add pluralize handlerbars helper to format text better
c13-4: make better upvoting algorithm
c13-5: add 2 new post lists routes (newPosts, bestPosts) to rank front page posts
c13-6: add active classes to the header