Server: Put database name in env variable

We were hard-coding the database name. Now
we're doing one step better, which is to
specify it in an environment variable.

Now we can start an app with a test database.
Index: Use relative path to read package.json
Test: Add app.js

A first draft at testing our server-side
app directly, using a database.
Init: Check for error on first circle creation

If the database isn't up, we'll get an error.
Test: App: /data/initialize

Add a second test to app.js.

It turns out, we can't setup and tear down
the database with every unit-test run with
our current way of doing things.
Fix: Data: Users: addMembership

We had a db.users obj left over from
our refactoring project, which caused
things to crash. Removed.
Test: App: Add a new member

Test the process of adding a new
member to the first circle.