initial
finish database structure and sample data
zzZZZZzzz
complete 'easy' queries
clean up
finish medium
clean up
refactors
User#average_karma = brick wall
Add 'w3d2b/' from commit '59c5724f15528ab70c4725cb40c0b6a20fd376d5'

git-subtree-dir: w3d2b
git-subtree-mainline: 537f7f822260c075931577a94fce1b5eb8ed9ba2
git-subtree-split: 59c5724f15528ab70c4725cb40c0b6a20fd376d5
splice work from class into master