Update coffeescript version

Yay sourcemaps!
Update rimraf version
When a commit changes, mark the previous commit in the model
Store prevCommits durably
Add tests for proper zero downtime deployment
Only route to commits that have been marked as healthy
Mark a commit as healthy once it's fully deployed
Remove checkStale call
Ensure full error is printed
Revert "Remove checkStale call"

This reverts commit c993f7524c9459908ee33a2c2c4af0df8f78a0c1.
Re-add stale process killing with healthy deployment checks
Refactor stale process checking