6.2.2 - work in progress
6.2 user validation
6.3.1 - add password_digest
annotate add of password_digest
add tests for password validation
6.3.4 flesh out model/tests for password
better debug()
handle validation of mixed case email
add users resource
add show action
initial profile page, with testing (7.1.3)
7.1 add gravatar
finish user signup