refs #181 add validation rule to blog comments
refs #221 'rails generate model user provider uid name screen_name image'
refs #221 create the twitter users, and log in the user accounts
refs #221 'rails generate migration AddParentIdToUser parent_id:integer'
refs #221 'rails generate migration AddTypeToUser type:string'
refs #221 'rake db:migrate' & 'rake db:migrate RAILS_ENV=test'