generate User model, add pending test
add basic User model test
modify Gemfile to use Guard, add comment about libnotify
add livereload to Gemfile
moved growl to development/test group in Gemfile
add email presence validation to User model and correspondinf spec.
add user name length validation, corresponding spec
add validation and tests for email in user model
add validation and tests for email in user model
modify gitignore
re-add database.yml
add uniqueness validation to user model
add table_print gem
add bcrypt gem
generate migration for password_digest column
add password validation tests, has_secure_password attribute to user model
add tests for password authentication
finish basic User model including secure passwords
Merge branch 'modeling-users'
finish chapter 6 exerises