Express time

This PR contains the changes from mongo-time and express-time.
Imports a bunch of project boilerplate for hooking to mongo, seeding dev data, and hosting a simple express site to show current users. Most of these files are express auto-generated, `uptime.js` and `background.js` contain stuff that needs to be reviewed, as well as some documentation in `seeds/`.
I'd prefer to have a single function pass the database into closures to prevent too many callbacks/parameters in defined functions and push the computation into helpers. This also has the bonus of keeping side effects isolated.