Add User show view and test
Utilize FactoryGirl to create test model object
Redefine BCrypt cost factor to speed up tests
Add sidebar and gravatar to user profile page
Set up signup form and tests
Handle signup failure
Handle signup success
Add flash messages to layout ; Set flash message for signup success
Add SSL in production
Add size option to gravatar_for
Add tests for signup error messages
Remove password digest message from signup error list
Add test for signup flash message
Use content_tag helper in view