Add 'User' model with test and add index to users email column.
Add password for User and it's validation with test.
Make a basic User model (including secure passwords). Last change is improving tests according to exercises.
Add debug page info in development environment and show page for users.
Add test for show page with FactoryGirl gem and speed up it by lowering bcrypt's cost function.
Add gravatar to show (profile) page with css.
Add sign up form with tests and handling errors.
Add SSL in production.
Finish user signup - update test and flash erb according to exercises.