add show action (public profile) and tests [7.1.3]
Add Gravatar to profile page
Add tests for signup functionality
Design signup page; Add signup form [7.2.2]
Use strong parameters [7.3.2]
Handle invalid forms [7.3.3]
Redirect registered user to his or her profile [7.4.1]
Show success flash message after signup [7.4.3]
Add SSL in production