Test displaying a welcome message after login
User is welcomed when they log in with twitter
Switch to sessions from Rack::Session::Cookie

Because we're not using any of the options for Rack::Session::Cookie, I figured
it'd be simpler to just enable sessions
Refactor tests to eliminate duplication
Wrote test to verify new users are saved
Integrate sinatra-active-record
Create user model and table
Extract shared spec_helper for feature and integration tests
User.from_auth_hash creates a new user
User.from_auth_hash does not create new users when user already exists
User.from_auth_hash returns a user
User.from_auth_hash updates the full_name of the user
Extract initializers from gossyp.rb

I was getting pretty sick of having a gigantic file for gossyp, so I pulled out
the setup for each of the libraries I'm using to make my life easier.
User is created on twitter callback
Destroy all users on each test run