cleanup routes.rb
add original fields to users table
create graduation_years table and define relationship with users
insert model annotation
install kawaii_validation
add validations to User
install ActiveModel::Serializers instead of JBuilder
[BUGFIX] rename column user.first_name -> user.family_name
[WIP] User registration 1: create user
use HTTP status codes
move UsersController to Api::UsersController
create dummy index page
move #full_name from UserSerializer to User
remove extra whitespace
QueryString.generate_url
[WIP] User registration 2: activation_url
[DONE] User registration 3: send activation needed email