Add gravatarURL but no md5
Add and require md5
Add failing blank email tests
Handle blank email in User#gravatarURL
Reorganise the test directory
Add user fixtures
Add failing users acceptance test
Add Users link
Add users route
Add users template
Add users route
Add failing user gravatar test
Add link-to to users template
Add user route
Add user template
Add email to user template
Add mail-to component and failing test
Implement MailToComponent#href