Adding the User model.
Moving debug creation into helper

This will be necessary for DRYing up upcoming portions of testing.
Creating a debug from homepage now creates guest user

This will only happen when a user is not logged in. Currently one test
is marked as pending. That test will be green tomorrow (07-20-2014).
Adding FactoryGirl.
Fixing typo in the FactoryGirl include.
Adding SessionHelper#sign_in method
Adding SessionHelper#current_user
Creating guest user when entering new Debug.
Making sure SessionHelper#current_user does not find users with null tokens.
Now guest user is being signed in properly

No more false positives when a user is passed in with a nil token set,
and no token set on the cookie.
Merge pull request #4 from brianbommarito/feature/guest_users

Feature/guest users