Offline data persistence

[Heydon]

Investigate https://github.com/GroundMeteor/Meteor-GroundDB

[robpre]

Notes:

• Meteor does a lot of its own offline stuff anyway; but it expects a database connection for startup. It will always need to point to a live mongo database somewhere
• GroundDB will be helpful when we need to be offline from the beginning, perhaps we disconnect manually and reconfigure the links to add stories and stuff to point to the live website.
• In order to export data from a "main" data base we need to pick one and stick with it. So that when we build we can export that data and create a JS file to load it into the disconnected app.