Add debug display
Create a mock for displaying user
Bundle FactoryGirl
Use gravatar image in user profile page
Add sign up test
Add signup form
Add create to user_controller
Support Strong Parameters
Error message of user registration
Redirect after a successful user registration
Display a flash message
Remove magic comment
Support size options in gravatar_for
7.6.2 Add test
7.6.3 Add spec "after saving the user"
7.6.4 Replace to content_tag