Allow anyone to create an account

Let's apply our "openness first" policy to signing
up, and allow anyone to create a circle who wants
to. We'll see how this goes. :-)
Turn off groups, for now

Groups will be a key component of larger circles
in the future, but for now we're not using them,
and the server-side calls are just fancy security 
holes at the moment.
Refactor: Extract method: Add stories for circle
Turn back on group getter

We need this for signing in.
Signup: Add a 'welcome' story list

Have a 'welcome to Circle Blvd" story list, for
new circles.
Signup: Put some details in the welcome story list