user login & logout [twitter or other 3rd party service]

[teganduong]

• Use Passport for OAuth with Twitter
  For sign up:
  User actions: sign in with Twitter username / password, return to a new view for Amblr signup page to add email address (with left menu closed), then return to home screen

For sign in:
User actions: sign in with Twitter username / password, then return to home screen

For sign out:
User actions: click logout, (which logs out of Amblr, but leaves Twitter logged in), then return to home screen