Use omniauth and omniauth-google
Change user model to contain oauth information
Use google's anonymous authentication
Create user from oauth redirection
Route oauth callback
Change session scheme to handle both oauth and normal auth
Show user's uid if name is not present
Use css-social-buttons
Place "Sign in with Google+" button
Update user's display name on each login
Validates uniqueness of email only when not oauth
Use twitter oauth
Place sign in with twitter button
Add changes for Gemfile.lock
Close #11