Add healthcheck routes:
	/ping - 200 with plain text "OK"
	/status - 200 with json server uptime info
Canonical url should not ever include port
updates dev to handle new Registry architecture
attempts to fill _users collection with filtered data in sample_users.json
checks if users are already in couch
adds admin & makes valid usernames

Conflicts:
	dev/sample_users.json
code cleanup for replicate.js
brings back npm run dev-repl
adds some missing design docs to dev
Allow public fields in dev couch.ini