rails g model User
rake db:migrate
Add users model and its spec.
Add more validations to User model.

name length, email format.
Add more email validation.

Email should be unique. case insensitive.
rails g migration

Add DB email column to unique index.
Run migration.
Add before_save hook to User model
Merge pull request #5 from maripiyoko/modeling-users

PR to merge modeling-users into master