Add a periodic check to ensure the working copy is up-to-date with Dropbox.

Closes #4.
Expose controls to customize the port/SSL/hostname.
Working towards Heroku compat.

Added images and updated styling.
Add run instructions to README.
Tweak landing page.
Added screenshot.
Integrate mongo/ose instead of client-sessions for centralized storage.

Used for sessions, as well as user settings. This will be nice when we have user preferences we need to store, so users don't have to set them independently on all of their devices. Note that we could, theoretically, keep the session data in client-sessions rather than mongo, which is admittedly a poor fit for session data.
Store path setting in Mongo.